Summoner Class Pathfinder

[mindulino]

I'm not sure if I understand the ability of the Summoner 'Eidolon':

I can add ANY monsters (no limit) to the combat. But not only combat in my turn or as helper, but any combat, included those the summoner is not directly involved. Is right?

And the other one 'Summoning': the 'top monster' is the first monster found in the discard pile, right?

Thanks