James,
Monster Summoner's Handbook describes summoning a monster as it has classically been presented, i.e. summoning an existing creature from elsewhere, as opposed to how you have described it on these forums as more akin to creating a creature for the spells need. Is this most recent description of the spell a step away from how you have described it? Am I misreading it? A miscommunication between the authors and yourself?
Otherwise this is a great book, that one little bit threw me off for a bit however.