How Does Marquez not have to defend his titles

[Check]

Now that the Hatton fight looks officially dead, I hope Juan fights one of the top lightweights. Anyone except Juan Diaz, please.

[Eric Holder]

now that the Hatton fight isn't going to happen he's probably going to make a title defense.....

but for whatever reason certain orgs don't force guys to make defenses

Shane Mosley went more than a whole year without fighting anyone, so did Daniel Santos.... and I can't even remember the last time Dzindzruk fought