PokerStars No-Limit Hold'em, $0.25 BB (7 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver Cards)

MP2 ($30.50)
CO ($36.90)
Button ($9.65)
Hero ($34.90)
BB ($25)
UTG ($20.50)
MP1 ($18.20)

Preflop: Hero is SB with , .
1 fold, MP1 calls $0.25, 2 folds, Button raises to $1, Hero raises to $4, 1 fold, MP1 folds, Button calls $3.

Flop: ($8.50) , , (2 players)
Hero bets $10, Button calls $5.65 (All-In).

Turn: ($19.80) (2 players, 1 all-in)

River: ($19.80) (2 players, 1 all-in)

Final Pot: $19.80

Shortie was unknown. Usually with unknowns I assume TAG until they give me a good reason to assume otherwise. Should I be assuming loose for shorties instead and slowing down on missed flops?