I think I heard this explanation before. Something like this.
It would create an unfair advantage if you were able to offer/sign a player to a huge one year deal, then immediately renegotiate that contract once it is accepted.
For example, you could offer someone $30M for one year and they accept because the value of your offer is more than anyone else's. Then, once they accept, you immediately resign them to a 6 year deal that they otherwise would not have accepted on the open market because there would have been a better offer.
My example may not be exactly right, but that's the main idea behind the rule.
Also, if there were no rule, you could just offer a bunch of one year deals to get your roster up to the max of 60 before training camp, then hope someone "booms" and then sign them to a long term deal.
Personally, I like the restriction about not being able to renegotiate one year deals.
Last edited at 6/04/2016 10:16 am