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					Originally Posted by llamabeast  0.625% means about one in 150, no? So if you recruit 3 a turn then you should get A5 once every 50 turns or so. That is much more often than the one every 660 or so turns from the Eagle King hero. | 
	
 From what I recall, MA Caelum has three different heroes. Two of them are multiheroes, the Harab  Seraphine and Eagle King, and one is a unique hero - some leader of the temple guard, I don't recall the specifics. My assumption was that you had an equal chance of getting one of the three - a 2% to get an eagle king per turn. As the MA Caelum Eagle kings have A5 unlike the EA ones, that's a 2% to get an A5 hero  perturn. If you recruit three High Seraphs you have 1- (1 - 0.00625)^3 = 1.833056640625% per turn to get a A5 (or more than one) High Seraph.
The 1 in 666 turns to get an A6 hero is a separate issue, and not one I have verified the maths for. I am only discussing A5  - and where the chance of a getting a hero with is larger than if you recruit 3 High Seraphs per turn.
The Eagle King by itself is certainly good enough that it doesn't need the A5 to be competitive.