Amen should be paid at least close to Alpi. Alpi and Amen are the future 1a 1b. https://www.nba.com/stats/players/traditional?CF=TEAM_ABBREVIATION*E*HOU&dir=A&sort=PLUS_MINUS https://www.nba.com/stats/players/advanced?CF=TEAM_ABBREVIATION*E*HOU&dir=A&sort=NET_RATING
An RFA extension is shorter than a team extension, so he could leave earlier after that deal (like gordon hayward)
Why would he leave for the same money elsewhere? Hayward left cuz he wanted to be on a contender not because of money issue. If Amen wanted to leave one more year wont stop him.