Seat 5 has to have trip sevens or I don't know what he's doing (certainly in the realm of possibility he's just going off with two pair though) Or why he's calling the last river bet if he only has trips against what at worst appears to be a flush out of those hands.

River three bet could be a value bet since seat 5 is stuck and seat 7's apparent flush isn't necessarily ace high. But I might just call if I'm afraid seat 5 is going to fold to that raise.