OBA has value in this league.
If you look at how this team is set up right now:
Top of the order types:
Alcantara: Career 5% BB in the minors. Sure he has tools but OBA is not one of them. He is a batter that I would plug lower to split up some RH bats and get a spark here and there.
Castro: He hits. Avg D. 12-15 HR power...ya sounds like lastella to me? But has been a all star 3 times and hits .300 many times and his BB% is not great but he makes up for it by putting the ball in play more.
Valbuena: He walks. below avg 3B D. league avg 2B D. He screams sub IMO and I'll guess he gets traded when Bryant gets up. Value and control wil play into it. He is worth a quality BP arm.
Coghland: He could break out as a player or he could fall back. His rookie year was just as impressive and he fell back after. I believe he is a league 4th OF.
Sure LaStella right now looks like a role player but he has plenty of control to dictate his worth. He brings 2 things. 1 LH bat. This team will have Baez, Bryant, Soler, Castro in the line up sooner than later and they are going to need a few LH bats to split them up. 2 OBA and again this team lacks that outside of Castro and Rizzo.
The good thing here is Maddon is the type to mix it up.