I don't think he's not been played by 3 managers because he's not technically gifted. He's probably one of the best in the club technically.
But if those set of skills can't help you overcome the pace and physicality of the league, it just won't work out.
It's why Koeman, Unsworth, Sam all have good things to say about him...but most of them felt like bringing in Beni or Davies because they're more robust, have more pace, physically stronger etc.
I said right after his first game he reminded me of Bilyaletdinov. He'll have some good attributes but they won't be good enough to get him playing regularly in the prem
You could very well be correct and I'm inclined to agree with you but it's difficult to write him off on the back of what's been an absolute mess of a season. There has been quite a few who have struggled to adapt to the PL before going on to flourish. Look at Lamela since Pochettino came to Spurs. He looked abysmal but has been very good since things clicked there.