Can't remember which website it was but someone did a really good analysis of wesley's strengths when we signed him, and it wasn't headers!
He's very good at dropping deep, retaining posession, spreading the ball wide, sprinting into the box, pulling front post defender out of position before nipping in front to finish a low front post cross.
It's all about timing and having a winger or full back able to beat his man. It'll come.