Inquisitor domain stacks with Cleric

[MyTThor]

APG states that an inquisitor must select his domain from one of the 2 domains he has as a cleric if he has levels in cleric. But it also states that inquisitor levels stack with cleric levels when determining domain powers. RAW do not specify that this stacking applies only to the domain selected as inquisitor, so would seem that every inquisitor should take a level in cleric to basically activate their second domain's powers, since the domain powers are the only benefit of domains that the inquisitor gets. Anyone care to comment on whether I'm seeing RAW correctly and if you think this is RAI?

[Dolanar]

By Raw yes, it seems a single level of cleric would access the second domain & you'd be Inq/Clr total levels for either Domain. However you would only gain the ability, not the bonus spells, So an Inq10/Clr1 would only have the level 1 spells, but the equivalent of level 11 for powers.