No not good for his development however I'll trust the club on youth "products" and the way they handle them.
A loan would seem to be the best option but for one reason or another that hasn't materialised.
Nowt wrong with an abrasive attitude - the man is a winner and had that mentality - if he feels certain players are not performing upto his standards then it's totally understandable imo
Kante is the dogs tbh - very good at what he does - you'll do well to keep hold of him. Good luck for the rest of the season apart from the game against us of course - hope you go on and win the title.