As someone already indicated, playing with other people is a good way to learn how to play. Certainly if this guy is limited in chops he needs to grow, but if you don't have a drop dead time frame (a gig next month, etc) perhaps it is best to simply have fun jamming. Naturally you can suggest "hey why don't you try a different beat", etc). You can also let him hear recordings of beats that you are looking for (I'm sure there are bands that you can both relate to).
If the guy has some talent and a true desire to get better, he will get better. Perhaps jamming with you is the kick in the ass he needs.
As already suggested, lessons may be in order. Again, if he wants to get better he will do what needs to be done, including lessons, practise, etc.