Yes of course but as far as I understand this topic it's certain that the bosmer we are talking about will take a part in the civil war.
I think the Bosmer would be more willing to join the Legion then a group that would look passed the secondary citizen status and still kill them because they are elves and officially members of the Dominion.
Well Ulfric is not a puppet. He is preparing to face his real enemy, the Thalmor, as soon as he and his Stormcloaks have took care with the Thalmor puppets called the Empire.
Er, yea thats all fine and great if it wasn't for the fact that the empire isn't a puppet, thats stormcloak propaganda and theres no real signs in-game or in lore to support the claim that the empire is a puppet of the Dominion. Ulfric actually had been motivated to launch the stormcloak rebellion by a Thalmor interrogator who filled his head with lies, told him the empire abandoned him and that the empire planned on wiping out Nord culture and religion completely, which is far from the truth, I really suggest you do the mainquest and read his dossier in the Thalmor embassy or at least look it up.