Don Durito
Hero
Basically at one point the designers say that they disagree about when someone should get to reroll to see if they get back a daily. Rob Heinsoo says you should roll after every battle (so if you use a daily in battle 1 you can also reroll after battle 2 and battle 3 even though you didn't have the ability to use in that battle). Jonathon Tweet thinks you should roll only once after the battle in which you use that ability.I confess, I don't know what you're talking about re: the barbarian...What's the issue, exactly?
Most of the Daily powers are rewritten in a straightforward way so that they could go either way. However, the Barbarian Rage seems to be written in a way that explicitly supports Jonathon Tweet's position.
It's really irrelevant. 13th age takes a lot of things from 4E, but it expects you to make the game your own (As should be made obvious by the fact that the designers often don't agree). There's a lot of the OSR attitude in it. A lot of the rules are there to explicitly call on the GM to make an off the cuff ruling about a situation.