The question I am struggling is why would Revis prefer a pay as you go structure from the Jets over a signing bonus structure from the Patriots. With a signing bonus he gets most of the money up-front. Please note that the Patriots often pay their large signing bonus in installments. In a pay as you go structure Revis has to wait until September to first receive any money. That is, unless the Jets agreed to deviate from the usual payment plan of 17 paychecks during the regular season. Six months of interest on $20 million is pretty significant.
I am also puzzled why Revis would prefer the pay as you go structure of the Jets over a signing bonus from the Jets. The Jets can get out of the deal and save cap space by releasing Revis before the start of the 2017 League Year. The Patriots can get out of my preferred Revis deal and save cap space on June 2, 2017. By that time a replacement will not be available in free agency.
The Patriots could have done what they did with McCourty (fully guaranteed the 2015 and 2016 salaries and have the 2017 season eventually become fully guaranteed). This would have bumped his fully guaranteed money at time of signing to $35.5 million.
Should the Patriots have matched the Jets structure? No, it would have meant a $21 million cap number for Revis ($16 million salary and $5 million signing bonus proration) in 2015. I currently have the Patriots under the cap by $13,611,603. Matching the Jets offer would have caused the Patriots to quickly create $2.4 million in cap space.
As I show in this blog, the Patriots could have done so but it is not wise to make business decisions under pressure.