Don't agree with the previous description of Witsel on here. In my opinion not at all the same mould of player.
De Jong is a much better DM that adds bite to the midfield. Witsel is a dynamic midfielder who's much more comfortable going forward than De Jong tho but not as effective in protecting the backline. At Standard de Liege he forms a midfield pairing with Defour and he's ten times the player when Defour is on the field because with Defour sitting back and playing as a deep sitting playmaker, doing the architectural work of the team, Witsel has the freedom to make runs upfield and he has a great talent of picking out good runs and thus creating opportunities. Imo he's a great allround player who is very comfortable with the ball at his feet and has the ability to beat a man with his technical abilities and speed, something a player like Barry misses.
With Fellaini absent due to injury these past months, Witsel was given the opportunity to play up top in a 3 man midfield with 2 DM's covering him and he has been Belgium's best player in the last 4 games.
Could form a nice midfield trio with Yaya and De Jong tho. With De Jong sitting back allowing Witsel and Yaya to infiltrate through the midfield.
As for De Bruyne, he's a great talent. But not yet ready for the EPL. He's now playing as a left winger but his preferred position is AM. With his great range of passes and cracking shot he could become quite the player but I think he's the kind of player that would benefit from going to a team like Ajax to hone his skills before moving on to a team in England or Spain.