Ehhh...personally, I think he just likes to say crazy random things, sometimes just to throw people off.
Like "
For Pony!"
Interesting theory, though. However...might I direct your attention to
Page 1. In Panel 3, Richard mentions that he had been thinking about killing Cale and taking his cloak. If Richard is Cale's future self who has traveled into the past, then killing Cale at this time would immediately delete Richard's entire existence (and then we would have no comic

). Granted, at this point he doesn't remember anything about his life before his undeath, which he would NEED to know from the very beginning if he's going to guide Cale into becoming himself (Richard), because otherwise how would he know who to look for? Judging by his current track record, however, it seems far more likely that if Richard DID go back in time, it was to amuse himself with a bit (okay, a LOT) of random massacre. But Richard doesn't strike me as someone who'd be stupid enough to go back in time for the purpose of going on a killing spree, if there were a chance that he could kill his past self due to not knowing who said past self WAS, and therefore remove his current self from the future (his present). Because then he wouldn't get to have any fun. And neither would we. So it's fortunate for all parties (except for maybe the group's enemies) that all he did was temporarily incinerate Cale.