Reg-me limping AKo in 6 max

This is hand I posted on my challenge. Please comment here or directly at My bankroll challenge: 2500 to 5000 before 2019, 10000 June 2019!.

Here is a hand where CO, which seemed to play too much hand and opening a lot of them, just came back from a pause and posted a big blind to play. I feel like someone would want that free sit in money so I start with a limp, which is atypical for me, in the hope to see a raise.

Please comment on my play (limp!) and equally interesting, on the villains' plays.

IPoker, $0.25/$0.50 No Limit Hold'em Cash, 6 Players

UTG: $79.62 (159.2 bb)
Hero (MP): $65.73 (131.5 bb) - VPIP 33 - PFR 25
CO: $50 (100 bb) 684 hands - VPIP 50 - PFR 28
BTN: $49 (98 bb) 1.5k hands - VPIP 28 - PFR 13
SB: $52.31 (104.6 bb) 1.3k hands - VPIP 20 - PFR 1
BB: $18.50 (37 bb) 191 hands - VPIP 53 - PFR 36

Preflop: Hero is MP with A♦: K♣:
CO posts BB OOP, UTG folds, Hero calls $0.50, CO raises to $2.25, BTN calls $2.25, SB calls $2, BB calls $1.75, Hero raises to $65.73 and is all-in, CO calls $47.75 and is all-in, BTN calls $46.75 and is all-in, SB folds, BB calls $16.25 and is all-in

Flop: ($169.75) K♥: 7♣: A♥: (4 players, 4 are all-in)
Turn: ($169.75) 6♥: (4 players, 4 are all-in)
River: ($169.75) 4♦: (4 players, 4 are all-in)

Results: