As Miguel used to say the gold standard for contracts is first three year average (provided sufficient bonus implicitly guarantees the player sees that due to dead cap implications) or the fully guaranteed money. Gronk got $13M fully guaranteed, and another $5M has a rolling guarantee. So I guess we should call the new deal a 4 year $4.5M AAV deal with an option...
Average or total new money can be spun, but the fact is absent guarantees a player seldom sees it. He gets more or less. AAV of the entire contract puts the player's cost in perspective. If he's here 6 years he will earn $38M or $6.35M per as an average. If he's here all 8 years he will have averaged $6.8M. If he's only here for 4 years he will have averaged $4.5M per. He will never average $9M per unless they void the option and opt to do another extension, in which case he will probably cost and average a lot more...or less. The more doesn't sound very Patriotic. They will have all the leverage.