What's a reasonable contract extension for Kamara to avoid possible holdout?

Fournette is on a rookie contract. Hard to use a rookie contract as a measuring stick. It's just based on draft slot. Correct me if I'm wrong, but I believe all 1st round contracts are fully guaranteed.

On that chart change "all types" to "veteran" to see contracts players earned in the market.

While there is nothing in the CBA that says a 1st round rookie deal has to be fully guaranteed they are almost always. There might be a few very late 1st round picks that only got 3 years fully but those would be few. Ingram was around 24th and his was fully guaranteed in the 2012 draft.