came over from a thread you were asking harvest info in. On the one you got given, it's hard to say what happened before, and many leaf problems won't ever repair, leaf damage pretty much stays forever. 9-10 weeks is average for harvest windows, but it's not uncommon for 12 week strains, and not unheard of for them to take as long as 14-16 weeks. Without knowing what caused the damage and the conditions it was in, it's possible the environment is retarding the flowering slightly. Realize this opinion is heavily influenced by you saying it was still 50% white hairs. It's hard to tell from the pic (little fuzzy).
Those other plants look like they are doing much much better, and since you raised those all yourself, I'd say your on the right track. Keep it up!