Seems like a temporary "cheat code" for as long as he starts. The problem/risk is that he'll possibly (or maybe even likely) go from what he's done the last two weeks back down to basically nothing if he doesn't start. So, yeah, if Deablo comes back and takes his old position, beware.
I would feel better about Harrison's long-term prospects if he was exactly that... More of a prospect. But, he's not a rookie, or anything close. He's 28YO and in his 8th season. So, he's been around for a while. That said, he was a relatively high draft pick (early 3rd) from Alabama, so I think he's worth at least keeping an eye on. I don't think he'll suddenly become a 3-year starter (and long-term, MFL would likely change his position if that WERE the case). But, could he help boost my DB scoring for a few weeks THIS year? It's possible.
I grabbed and stashed him where I could (and where it didn't really cost me much/anything to do so). I figure it's worth watching, and if Deablo doesn't play again this week, I'll plug Harrison in with (mostly) confidence. If it doesn't work out, I didn't spend much. And you have to be willing to spend/take a few chances to win, in my opinion, so why not.