What are these character flaws Tielemans has supposed to be?
I follow and watch Leicester fairly regularly because my brother is a fan of them, and I guess the worst I would say about him is that he isn't always the most intense player out there. With that said, his defensive involvement is quantifiably fine (he's average-to-high in tackles, blocks and clearances per 90 compared to the average midfielder and only really performs somewhat poorly on interceptions), and that's probably more than adequate playing alongside Casemiro the vast majority of the time.
He is and always has been a very good progressive player at Leicester. Unless Frenkie is actually available this summer and not for a feck off price, I'm yet to see anybody put forward a better suggestion for the role than Tielemans on a free.