I actually tried this intinally. Did it again, and ae2 comes up on the 4300VC LACP shows distributing and collecting.
On the 4600 side, I se the "A" switch to periodic fast active, the "B" switch I did the same but ae2 never shows as up. I tried doing periodic fast passive, but the same results.
So in summary, I setup ae2 on all 2 devices:
ae2 on 4300 VC = up @ 10G
ae2 on 4600A = up @ 10G
ae2 on 4600B = down
I'm still seeing the same behavior, I think it may have something to do with spanning tree priority between each 4600 since I am using et-0/0/24 as a trunk port between the two.