I thought one of the Athletics Canada documents said that there is no repeat performance requirement for the marathon. I could be mis-remembering, though. Reid had to hit the IAAF standard of 2:15 in 2011 because his 2:11:23 was in the fall of 2010 (STWM) and the IAAF qualifying window didn't open until January 2011. So Athletics Canada's qualifying window is larger, but their standard is harder to hit. They accepted Reid's 2010 race for selection purposes, but they have to abide by the IAAF qualifying window, hence Reid's "repeat performance."
It will be interesting to see what happens. If Simon and Dylan both hit standard, then Eric will have to run Rotterdam or something else around that time with Rob. Unless either Dylan or Simon runs 2:11:28, because then Eric is still ahead. But if Simon doesn't hit standard, does Eric take a chance that Rob or Dylan won't hit it and just start getting ready for the Olympics? Rob's an outside shot, but that's still a shot.
Maybe Simon misses standard, and Eric decides that Rob's not a threat and stops training with him, but Eric and Reid still train together and Rob feels really left out and he gets really depressed and starts drinking heavily every day and this causes him to not hit standard. But then he returns to the steeplechase bent on making a comeback and ends up beating Alex Genest out of a spot on the team and the two have a huge falling out over it. It would be like a soap opera - 'thons of Our Lives.