There are reasons he was the only Servant I grailed to 90 without long and hard contemplation, and that's one of 'em.
I've got only eight months under my belt, so I don't feel bad about still having a lot of Servants to max. For a brief moment Fionn was the only gold Servant I hadn't maxed -- he's sitting at 60 now, waiting for Evil Bones. But then both Penthesilea and Wu showed up in the same 10-roll, and the GSSR gave me Orion, and with the event starting in a few hours, I'm pretty sure none of them will be maxed before Summer Scathach shows up. (Especially Wu. I'm banking Assassin embers for Scathach now, and she'll have to cope.)
I am pretty close to having all my non-story-locked 3-stars NP5, though. If I get nothing else out of spending way too much quartz on the Summer 2 banner, maybe I'll top off Lu Bu and complete the lot.