He was a major letdown to me as well, although that's mostly my fault for making big assumptions.
-assuming he'd be able to reach 180 bst
-assuming his weapon would be at least half decent for AR-O tank (any 2 of dc, slaying, debuff null, reduction like close call Bs, nfu, or null guard would have sufficed)
-not thinking that he could be the awful slow-bulky infantry stat spread I detest
Essentially he needed to at least be 180 bst (with IV fruit if needed) for me to grail him up, but I was more looking forward to finally building a merged unit that could use Spurn for AR-O. He failed both points, so guess it's back to hoarding excessive grails.