Forum:Machina armored unit and Jade knight

Well, first of all I'd like to know why you can special summon several monsters if you have one more than copy of Machina Armored Unit, I see it being the same situation as Heart of the Underdog and that one loses the timing...

Anyway, as stated in official guides you can special summon several monsters, but if you have a destroyed by battle Jade Knight with Machina Armored Unit, would you be able to add the machine type monster to your hand? I'd say that no but as MAU allows to do something that for me looks that totally missing, maybe it allows to put an optional effect between it's resolution even if it's not the last thing happening.

Greetings.