Nah I disagree completely with that assessment. The man came to represent TnT for the Digicel Cup as our only overseas striker, and whatever he may have done happened in training because he was not our first choice striker at the start of the tournament. Wim used Glasgow and (I may be wrong here) Joel Bailey and there was some other just-out-of college striker (Abiola Clarence, maybe?) who got a sweat even before Roberts got a chance. Sealy didn't perform when he get his chance in the second game or whatever, but at the same time, he has always been a goal poacher and strikers thrive on confidence.
Sealy is very much a Romario type player who will seemingly be out of the game entirely but always be in the right place for the simple finish. Yes, his awareness and off the ball movement is good but to say he ever ran around and showed much effort prior to that game is an exaggeration.
And to say one bad performance, under Wim to boot, ruin his entire career is nonsense. If it was Corneal or Bertille coaching then I could say he getting bad mouth cause them is hold grudge, but not Wim who all sides of the footballing admin unite against.