In all honesty the Browns will eat the rest of Watson’s contract and it will most likely be a failure(can’t see ,much more than maybe playoffs next year before cap hits them hard). I mean people will point out the guarantees but most QBs the number is going to end up as “guaranteed” just by them being rostered as they as usually tied to regimes. Like the Browns would not be cutting Watson right now if the money wasn’t guaranteed. Plus contracts keep going up so they really can only get worse.
I am trying to analyze this from an actual contract standpoint not a " Watson is evil" only standpoint which many will do for upvotes. Heck I might argue JC Jackson’s current contract with SD(now NE) might be the worst as he is being benched on a second team that already benched a CB in Jack Jones. Watson was at least playing when healthy.

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Now as a wholistic thing the trade and contract has a good chance of going down as the worst ever but the contract itself probably not especially if Watson comes back at league average at least next year. I mean if he plays out the contract at that level and maybe makes the playoffs once he becomes the current Browns best QB kind of by default.

This reminders me a lot of early Singletary for the Bills where his Y/A were really high but I think they were putting out the husk of Frank Gore each week.

And this is worse because they used a much higher pick on Robinson