Rumor has it that JS7 felt like the new YZF had a little muffin top going on and it was throwing him off his game?
What does the Joe Gibbs team do? 
Fabricate a beautiful & thinner aluminum tank, mould some new matching radiator shrouds.
The grapevine was also saying that yamaha was not into it at all as they don’t like the teams messing with bread and butter of the bikes.
I have a feeling this will all be forgotten if it helps the tuning forks get up on box week after week.