Paul Merson has paid tribute to Kobbie Mainoo’s ‘amazing’ impact at Manchester United with the teenager opening his Premier League account with a 97th minute winner away to Wolves on Thursday. Whisper it, but Manchester United might have just found the Frenkie de Jong-style midfielder Erik ten Hag so desperately wanted at Old Trafford, all without spending a single penny. Is there anything Kobbie Mainoo can’t do? We already knew about the teenager’s press-resistant qualities, his immaculate close control, his unshakeable mindset, and a passing range which would not have looked out of place in …