Developing legendary player

[Hpk]

And I got this one in my league, level 7.

He is tanking.
But how is that possible? How much had he spend to get to this?

BTW, I've checked the stats of these players, and having in mind, that they are not performing as they should in the league, in CL and Cup they don't play as somebody would think they should. I got him in my CL draw as well, where he is going for the title, but the results are not showing the quality difference.