Sen was never like this when he was in the main roster. Hope he does well in the future though.
If i was SEN, I'd pick rather zellsis or pancada to sell to another team (most likely pancada at this rate) and replace him with a promising t2 player who they can train up. They'd get bank from selling a player like pancada, and they will then have the 6th player as a promising prospect which they can profit off in the future rather by selling or playing. Meanwhile Pancada can be the star player of another team and Sentinels don't have to fear overcooking with their roster by constantly swapping out a 6th man for someone else on the team.