Agree with you about basketball players Who become TE's (Jimmy Graham, e.g.). There have been TEs who have become good OTs. (UM's Mark Cooper, Eric Winston).
When I look at the OT recruits (Tommy Kennedy, Zion Nelson) I look for quick feet, balance, flexibility, and good use of hands. Overall, I look for twitchiness.
A lot of OLs are huge lumps who are really leaners. They probably can't be left tackles.
Exactly man, plus going up against an aggressive d-line all day long in practice, that'll force their talent to come out, but mostly its about heart!