Wendell used to be good 3-4 years ago during Schmidt's era and he was young at that time as well, would understand bigger clubs wanting to sign him then and Leverkusen rejecting them.
Like so many Leverkusen youngsters over the years though, he didn't develop enough and is now losing his spot to Ajax's former second choice LB.
It's sad when you look back at the 2014-17 squad when Leverkusen matched the great A.Madrid team to the point of only losing on penalties to them. There was so much hope about that team that it could develop into the next Dortmund with young talented players brimming in the side like Leno, Tah, Henrichs (though I never rated him highly), Wendell, Jedvaj, Hakan, Brandt, Lars Bender. None of these players reached their true potential and a couple, Hakan and Leno, improved after they left Bayer.
Makes you wonder how the others might have turned out had they left earlier.