No, don't worry about that (about trying to get the timing right). Reasons: (1) I think it would be pretty much impossible to get everything timed perfectly. Every single time something happens visually it is synced to the soundtrack. To keep that in sync would be impossible. (2) I'll reanimate it on my end. (3) The number one goal of re-doing the thing would be to get a natural sounding voice. I'd say just speak it naturally and feel free to kind of do your own thing...be natural and organic about it. The visual can be adjusted accordingly.
!LUV