>>/1643/
They most likely are. 
It's just that Bonbi still plays a decent amount of Overwatch even without him. Could be that Seth has some irl stuff like a job (implying) going on in the meantime or that he likes to just watch. Or it could mean any number of other things. 
Just saying that it's interesting that Bonbi seems to be playing more on her own/with somebody else, or that Seth is using a different account for some weird reason.