I only saw Brighton play 2 or 3 times last season so I'm hardly in a position to judge Bissouma...........but; I focussed on him in one game towards the end of the season after I saw that we had been linked with him. He was very unimpressive! He did very little of note and was directly responsible for one of the 2 goals Brighton conceded. He completely mis-kicked a clearance which directly led to the goal; and was indirectly responsible for the 2nd goal as he failed to track his man back into the box, who subsequently set up the goal.
Anyone can have a bad day but hopefully he's considerably better than his performance that day would suggest.