Fluker was a terrible OL while with the Chargers. First off, he was drafted as a RT but performed so poorly at that position that he had to be moved inside to RG beginning with his 3rd season. FWIW, PFF has always graded him as a below average or worse player at his position, whether T or G. That has included always grading him below average in run blocking. Watching all of the Chargers games during his tenure there, I think that is a fair assessment.
The Chargers initially picked up his 5th year option, but then released him after his 4th year when his original rookie contract was up. Then he signed with the Giants, and they let him walk after one year. So in two consecutive offseasons, he has been released by a team with a poor OL. That does not suggest optimism about his ability.
It is true that the Seattle OL has been bad, so it is conceivable that Fluker could serve as a minor upgrade if he remains healthy and plays well (for him). But I will be very surprised if he makes a major positive impact.
Following this up. I had a chance to look at PFF's grades for Fluker, and I overstated things a bit.
Overall, PFF has graded him as below average in 4 of his 5 seasons, with his second season being the only one with a positive grade. That has been more due to pass blocking than run blocking. His pass blocking has been well below average in 4 of his 5 seasons; he was right at average in his second season. His run blocking has been above average in 3 of his 5 seasons, but the trend is a bit strange: slightly above average in first 2 seasons, below average in season 3; worse in season 4; then back to slightly above average in season 5.
On the bright side relating to this thread, Seattle's guards were much worse at run blocking last season, so Fluker should be a significant upgrade for run blocking. And one of Seattle's guards (Pocic) was even worse at pass blocking than Fluker. So at least maybe he won't make Wilson's pass protection (significantly) worse...
IMO the worst sign for Fluker is bolded above.
He's also a veteran not prone to penalties like Ifedi (who could lose his job to George Fant if he can't cut out the flags).
Well, no one is prone to penalties like Ifedi... he led the league by a huge margin with 19 penalties last season. The next closest was 14. That 19 penalty season might be an all timer, not sure where to find historical data on that.
Fluker had 5 penalties in 446 snaps last season, which scales to 11+ for a full time starter, which really isn't very good, especially for a guard. But I believe he played both guard and tackle last season for the Giants, and I'm not sure where he was playing for those penalties. Also, prior to last season, he played 883+ snaps every season and had 7, 9, 13 (adjusting to guard?), and 6 penalties, respectively. So maybe last season was a bit flukish.
The Tom Cable question is interesting. He remains a genius and highly paid. He carries a 4.5 grade on my OL coach grades (yes that's a thing). He is creative and can develop UDFA into starters. However, he tinkers with the lineup endlessly and it can hurt the team in the long run...
As for Cable, he is now with an OAK unit that has 4 out of 5 positions solid and they will hopefully limit his mad science to the long-term RT project (assuming Kolton Miller swaps to LT after this season) and the 2nd team line (Vadal Alexander, Brandon Parker, David Sharpe, Jylan Ware) all need coaching.
IMO Cable is overrated. Can anyone link any articles that provide any quantitative analysis on his performance as OL coach? Have any of the OL he "coached up" sustained success in Seattle or gone on to success elsewhere? I don't think so.
He was also "run game coordinator" in Seattle, and that worked fine as long as Lynch was healthy and productive. Once that stopped, so did any semblance of run game success, despite the fact that Seattle has a great running QB.
As a Chargers fan, I'm perfectly happy that he is the Raiders' OL coach. That should mean that their OL pass protection capability will erode pretty quickly, which fits perfectly with the Chargers' strong pass rush and secondary.
Mike Solari won't have to be as creative
The bad news is that Solari has generally not been good as an OL coach. Article on this:
Mike Solari may not be able to fix the red zone rushing issues