The best analysis of the Marcus Peters trade I have seen so far comes from the KC Star’s Terez Paylor. His piece is here. Give it a read.
The gist is that the Chiefs, according to Terez, expected Peters to demand a ton of money. The highest paid corner in the league is currently Trumaine Johnson who is making over $16 million on the franchise tag. Terez pegs the number the Chiefs were expecting from Peters at $18 million per season. Peters has one more year left on his rookie deal plus the fifth-year option so effectively two more years under contract.