Mind you this is a $0.25 90 player on Stars, but how did he make the call preflop?

Board:
ffcowboy76 (BB): $4,505
xl_fenix_lx (UTG): $3,240
mitchz85 (UTG+1): $9,445
HARD212121 (MP1): $4,195
phocky3544 (MP2): $1,640
LEARLY (CO): $1,635
Gr8Scott1969 (Button): $4,920
BizzoJones (SB): $2,235

Dealt to ffcowboy76 K:heart: A:diamond:

Pre-flop:
xl_fenix_lx calls $50
mitchz85 calls $50
(3 folds)
Gr8Scott1969 calls $50
(1 folds)
ffcowboy76 raises to $250
xl_fenix_lx calls $200
mitchz85 calls $200
Gr8Scott1969 calls $200

Flop: ($1,075) 7:spade: A:spade: 4:heart: (4 Players)
ffcowboy76 bets $900
(1 folds)
mitchz85 raises to $9,195 and is all-in
(1 folds)
ffcowboy76 calls $3,355 and is all-in
mitchz85 returns $4,940

Turn: ($9,585) 5:heart: (2 Players)

River: ($9,585) 8:heart: (2 Players)

Results:
ffcowboy76 Showed K:heart: A:diamond:
mitchz85 Showed 7:diamond: 4:diamond:
mitchz85 wins $9,535