Diggs. Lamb just hasn't proven himself the way guys drafted in a similar spot like Justin Jefferson and Jamarr Chase have.
You don't pay just-good WRs the future Hall of Fame WR1 money. That's how you end up being just above .500 more often than not and staying in salary cap hell.
both will be with the team long term
If Lamb wants a similar deal to Gallup, adjusted for cap inflation, then sure.
If he wants the kind of money that Justin Jefferson will command, then he can go pound sand.