Alpha sheets can now be added to games via the edit option in the alpha sheet display. In addition, statblock embedding should also work for the [sb=show][/sb] tags. Any problems, please post in experimental features with links to the sheet and the game.
It states in plain English that the speed is determined by its ” base form.” But I'll bow out of this discussion as I don't want to influence the GM in any negative fashion. Assuming you are correct, what happens when you're Eidolon is sent to its home plane?
and the Quadruped base form has 4 legs, which gives it +20 speed. Assuming they have their own base speed which, after looking at the 'serpentine' template, may be possible, you then add the 20 speed, which gives the Quadruped it's 40 movement speed.