There are two points.
1. His age should put some dents in his explosive speed changes. It will be a little bit, but considering they are all pretty close this might make a difference.
2. More importantly, he seems more muscular, more weight in "unneccesary" body parts. That will be negative for his KW/Kg ratio, which should translate in worse climbing.
That said, I'm not so sure that he will be dropped.. I expect he will be able to hang on and bring it home again. Normally I would change expect with fear as I'm not to fond of Lance's personality, but I can't deny I find it fascinating. If he pulls this one off it will be a riot, well worth watching. And truth to be told, the way Liberty was demolished, yet favorite son in law AC got spared makes me dislike AC even more.
Pick your poison I guess