So far, Segura's defense looks so good that he should have a lot of long-term value. I guess Olt's defensive value is probably comparable, but Segura also looks ready to hit at the big-league level, while Olt is probably at least a half-season away yet. I won't argue that Segura will outhit Olt overall, but Jean will defend at a very high level, steal a lot of bases, and has the kind of swing to rack up lots of XBH. Olt has a great ceiling, but Segura looks to have a very nice floor at SS.