FWIW, I'd wait a bit to switch to zone (mostly because I abhor the 2-3 now, 3-2 is OK, but I'm definently becoming much more of a m2m guy) Using my chicago squad a couple of seasons back, I recruited a team to play zone, but after growing to hate it, switched to man. I still had several players that I thought were ill fitted for man, but ran w/ them anyways. What I found was that as long as you had good speed & ath, you could cover up for lower DE ratings in D3. Skidmore, might have DE a notch too low, but he's got some great speed at the gaurd/SF spots. His defense wasn't too bad this year, but youth definently did him in.
Anyhoo, some fuel for thought.