Gerry didn't say he had a prototype at the THM....as I recall, he said they had a "test vehicle", or words to that effect and they were attempting to get through FDA testing....and it failed.

Other than that, your points are accurate.

Currently it is total speculation...what Cook was wearing on his arm could've had any number of manufacturers equipment onboard....or only one....in addition to the iwatch, which presumably will carry the sensor and display the results.