It is no surprise that something that cannot be demonstrated solves something for which it was invoked. The CMBR existed prior to inflation. Inflation was created to explain properties of CMBR, so it is not unexpected that the properties of CMBR are consonant with the explanation. But, matter attaining a velocity of the absolute universal speed limit and then exceeding that limit is not an expected consequence. However, that consequence is hand-waved away.