I am both a LenDale and CJ owner myself. I think this is exactly how it's going to play out. CJ will be plugged in during opportune times and will frustrate with his production from week to week. I think that LenDale is still the sure fire bet in that backfield. CJ still has a lot to learn about the pro game (as do most rookies). He reminds me of DeAngelo Williams. Has all the talent and speed but was slow to pickup the intangibles like blitz pickup, waiting for holes to develop, etc.

1. Funny that this point about LenDale being the sure-fire bet keeps getting brought up again and again by disbelieving fantasy football leaguers, but everyone connected with the Titans (including the coaches!) have said that Johnson will be heavily involved in the offense beginning in Week 1. That is some impressive obstinateness on the part of LenDale owners.
2. Funny that you try to take away from Johnson by knocking his intangibles and blitz pickup when those have been mentioned as strengths all summer. Vince Young has praised him for his blitz pickup, Mike Heimerdinger likes him for his intangibles and willingness to work hard, and it's been noted several times that Johnson had the offense down pat right from the get-go.
He reminds you of DeAngelo Williams, ergo you project Williams' weaknesses onto Chris Johnson whether they exist or not?