[Billfred]

If I were picking, I'd be picking around a gameplay style that was familiar to us from Orlando: inbound, truss to human player, high goal. Generally two assists, sometimes three depending on the flow of things. (I imagine teams playing different games will build their alliances the same way, this is just what's worked for us.)

With that in mind, here's my thought process on the fourth robot:

-If this is my fourth robot, it's probably going in when something's broken and someone's flustered. This robot had better be tough as a two-dollar steak, and the drivers had better be cooler than a polar bear's toenails. If I'm scouting this on the field, I'm looking for breakdowns, comm drops, and fouls. If I'm scouting this in the pits, I'm looking at parts available, pit organization, and generally how the team's acting. Bumper score also counts here, if you're a subscriber to that theory.
-At least 1-ball autonomous. At the Championship eliminations level, you need all three balls in the high goal. If you're at least carrying your weight, that opens up options should my partner's multi-ball crap out. In a perfect world, they'd aim for the hot goal--but I'll take the guys hitting 100% on spray-and-pray over the guys hitting 70% but aiming. Chasing the ball takes too long.
-Since you're hitting the 1-ball, you're obviously capable of trussing on some level. Truss to human player would be best most times, but this may be forgivable depending on the floor pickups of my partners.
-Three-assist possessions might not be EVERY cycle, but it's a card I want in the deck. How easily does this robot get possession? How easily does that integrate with my partners' play style?

The fourth robot on the alliance may not win the Championship for an alliance, but it could lose the Championship. Pick accordingly.