I think the problem is that Pacheco might not be versatile enough. He may be a decent enough player in a single role, but he will never get that role in the first side as long as Meireles and Gerrard take the field, especially with Suarez now as well as the plan to play a 2-man frontline.
I would have thought Pacheco's chance would have come against Sparta Prague had Kenny played Kuyt as the lone striker rather than N'Gog, but if Pacheco can't defend from the front the way Kuyt does (and I don't think he comes even close), then with Meireles as an attacking midfielder it becomes hard to actually justify putting Pacheco on the pitch since we must change formation just for him.
I think he's talented. I think he deserves a chance. But I also think that he's in the one position where we have an abundance of world class players, and honestly should have gone on loan in January. Having said that, he's flattered to deceive when he has been on the park, so he clearly needs more time. He's only 20 - give him another season to show he's got something.