His market value is akin to what the Rams got for Jalen Ramsey, about a 3rd round pick. Since Latt has greater history of injuries than Ramsey had when he got traded, it may even be a 4th rounder.
That's what the market is.
So when we trade him for a 4th that can conditionally be upgraded to a third, Loomis did't get "fleeced," that's what Latt's trade market is.