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First of all, change your tone, and secondly, you can verify everything that smart people tell you yourself.
I'm not 100% sure about all the racial abilities, but I definitely couldn't attach an Angel Guardian to the joining Orcs in the tutorial campaign.
The dumb AI kills whoever it wants to kill, and reinforcements don't affect that. For the Alliance, it kills Griffins; for Inferno, it kills Dogs. So, attach reinforcements to them.
If a person plays a battle to the end, they will have to kill everyone in the end, including the reinforcements. The unit to which reinforcements are attached is either the most durable (if playing defensively) or the most powerful (if playing offensively). In the second case, this stack will be targeted first. So, please, treat your own head, not mine.
War usually ends when it ends. For such great rushers as you, it might end quickly... and judging by your knowledge, usually in defeat, haha. In Heroes 6, in Multiplayer, you can set up accelerated development and reach level 15 in 2-3 weeks.