Hero shoves all-in, SB snap calls with 66.

I was not too worried about the Q, but did not want to see any more overcards come which is why I shoved. What I didn't really think about was SB's check-call on the flop for 1/4 his stack on a relatively dry flop. The only hands that would make sense for him to do this is with 77, 66, 33, and 45, maybe A6, and a small possibility of 58. 99, TT, A7 he most likely would CRAI on the flop, JJ+ likely a preflop shove. Doesn't seem like the type that would just float with AT/J/Q/K. Wondering if a check behind on the turn was wiser to evaluate river.

In addition, I analyzed these two hands (66 & 88) in Snapshove, and said 6x6x open shove for 18BB was reasonable, as well as a 21BB open shove with 88. Wondering if open shoving 21BB with 88 is better than doing a standard open.