MiamiWolfe
Pathologist
It's very true that the friendship that was starting had flattened, and IMHO it's because their personalities are similar. Both can be stubborn and hard headed when they feel they are right, which is typical in males in general. And since they both are not afraid to speak up, Eric and Ryan butt heads a lot. Though I think that having someone who can keep pace is a great attribute to look for in a friend; oh well Eric's loss because Ryan is one heck of a great friend.
I agree starzgirl that them being this way had caused the progressing friendship to come to a stand still, but I also think it's because they are still in some way trying to see who will be the alpha male between them. What they fail to see is that compared to Horatio thay are both little boys fighting over a spot in the sandbox. They just need to go for beers and make-up.
They are both alike and males and I believe that is most of the problem. I am not trying to pin this all on Eric, but he really never has given Ryan a break from day one. Maybe more for the fact that he wasn't Speedle and he was grieving for someone he had a great relationship with. Eric, who is an emotional person, seems to accept Ryan at one moment, but is quick to think the worst of him (for example, in WISC) when things aren't peachy. Ryan isn't exactly blameless, but IMHO most of Ryan's behavior is a knee jerk reaction to Eric's reactions to him.
This brings up an interesting question: Let's say Eric had died and Speedle had lived, what do you think Speedle's reactions to Ryan's hiring would have been and do you think Speedle's overall interaction with him would it have be different and how?