We also already have a Maw of the Mire. There's just no way we ever need 3 of that effect. Cloistered Youth is the only card here that has a reasonable chance of making someone's deck.
I was definitely tempted to hate draft here too, as Wolf Run is head and shoulders above any cards we can play. Still, Scarecrow is a fine inclusion in all but the most aggressive decks, which this deck is not.
This is an interesting pick. I've never really seen Grimgrin played much outside of Commander, so I'm not actually sure how good it is in draft. What posertom fails to mention is that Butcher's Cleaver has a fairly low ceiling too. Aside from the wombo combo with Stalker we only have three other humans. It runs the same risk of being blown out by removal, though it's just a big tempo hit instead of an actual two for one. Repeatable Bone Splinters on a massive body can be a huge game, and the fact that it seems more fun and IRL I would just want to see how the card performs makes me want to hedge toward Grimgrin. On power level alone the cleaver may well be better, though.