Saints Need an Offensive Weapon
It's worth noting a guy like Tre is a 5th year senior. Two more seasons than a guy like Tet. 5th year seniors are reg flags in general.
Sure the age difference is worth noting. All things equal between 2 prospects, you'd likely want the younger one. However in the grand scheme of things, it doesn't mean much and isn't something I would describe as a red flag. With the recent changes to Transfer Eligibility, NIL, and even the COVID impacted seasons, whatever anomalies there may have been in the past with some 5th year senior's likely won't apply the same way anymore.
I can't imagine the Bengals are upset about Burrow being a 5th year senior, the Commanders probably aren't upset about Daniels being a 5th year senior, or Broncos likely aren't upset about Nix being a 5th year senior. I'm sure there are plenty of other examples, but those 3 just immediately popped into my head. Or if we need a recent WR example, Ricky Pearsall was taken in the 1st round this past year. His season was railroaded a bit after getting shot right before the season, but he certainly looked good last night with 8 catches, 141 receiving yards, and a touchdown. Or even a guy like Jayden Reed 2 years ago is an even better comparison as he went a similar route that Harris did transferring from a small school after playing well and finding his way at a bigger school in his final seasons.
Edit- After looking a bit more- Cooper Kupp, Deebo Samuel, Terry Mclauren are some great examples of recent 5th year seniors that have become top tier WR's in the league. Could even consider our very own Michael Thomas to be pretty much a 5th year senior as he spent a year at Fork Union Military Academy after high school then went on to play 4 seasons at Ohio State.
For a guy like Tre Harris. He did well in his final season at LA Tech. Then transferred to Ole Miss and had a very good year last year for them and was excellent this past season. This isn't a guy that just randomly started playing well in his final season. He's been playing well the past 3 seasons. More importantly he possesses all the tools you'd want from a top tier NFL WR.