Thanks for the input everyone!
Just to clarify something I indicated earlier, what I'm ultimately planning to do with this list as June race results come in and rosters are finalized, is fine it down to 22 riders, one from each team, in an effort to predict which rider on each team will finish highest on GC. I realize I screwed up in the thread title and my original post in describing them as "captains"--a romantic's notion--but have since been convinced by you good people to refine my efforts. After all, every team won't be riding for GC or have a clear-cut GC captain, but every team (assuming they have at least one rider finish the Tour)
will have a highest-placed rider in the final GC, whether they want to or not.