It's not just Benteke that has got worse at finishing, it's the whole team! Players who were previously chipping in with goals (Zaha, mcarthur, the odd defender at set pieces), coupled with the fact mili's set piece quality has declined (except penalties), shows that it's something to do with training. We've scored the least amount of goals in whole of PL, and Benteke is still regularly scoring for Belgium when he plays.
The facts all point to something changing in training (maybe a focus on shape and defending instead of finishing?) since Roy came in.
I personally don't mind too much as we have our highest ever points total at this stage of season. But I do think benteke gets a rough deal from it!

The Guardian doesn’t have Tosun in the squad, has he been Camarassaed?

Benteke played ok today, set up the goal and generally held up play reasonably well. However he fluffed his lines in front of goal yet again, so the big question is can we continue to play with a centre forward who does not score goals? Unfortunately it is not a position where you can hide. You either bury chances at a reasonably high percentage of success, or you don’t and that stat kinda defines a centre forward.

I must admit I no longer consider him useless because he has some decent play in him, but as a goal scorer he looks finished. I understand why Roy continues to play him but we desperately require an upgrade.

He should only retain his place if he's scoring.

This.
Regardless of his assist today Tekkers should start on the bench. He's woeful.

Buy Litecoin.

He wasn't today , and if everyone else's finishing wasn't as bad as his he would have many more assists to his name.

Palace as a team at the moment seen to be able to invent new ways of missing chances