Help! Wiped cam lobes? - Video inside

Yes, I didn't think everything was moving in the first videos, either. However, the expectation that all rockers will move the same amount is misplaced IMHO.

With the advent of dual pattern camshafts (e.g. Comp Cams Dual Energy line) there can be a difference in lift of exhaust and intake valves. Typically, the smaller exhaust valve receives compensation from the cam designer in the form of greater lift. That said, all intake valves should move the same amount and all exhaust valves should move the same amount.