Re: I have Galaxy Tab 10.1 and a Droid Bioninc. How do I sync the 2.
Unfortunately this usecase is not yet covered and there's a need to have a computer to finalize the creation of any account.
As you mention, both devices are considered Mobile devices and in both cases don't have the capabilities to create an account, only pairing to an existing account. The team is working on it and it will be soon implemented.
In the meantime, you can create an account in any computer (there's no need to keep the account active in that computer).