Take Hunter and we'd likely need our 2nd, one 3rd and a 4th to move up to 21 for a starting OT
A) Hunter
OT at 21
77
B) OT at 9
new pick (probably a 2nd)
old 2nd
old 3rd
77
old 4th
Wrong draft to be trading down from an elite player. You would only need to give up the first 3rd rounder to get back to the 20's
You win in the NFL by getting a few elite players and then filling in with average players around them but you first need the elite players.
Let's see the #3 pick (or first non=QB after #3 historically vs 9 and 41 and determine
WIN or LOSS by taking at #3. Of course, this draft is amongst the weaker drafts with only 10-12 first round talents so you would less likely want to trade down in a weak draft.
2016-Joey Bosa vs Leonard Floyd and Reggie Ragland-
WIN
2017-Solomon Thomas vs John Ross and Dalvin Cook-First round picks is a wash,
LOSS due to hitting on Cook who is solid but not a star
2018-Darnald but first non-QB Denzel Ward vs Mike McGlinchey and Harold Landry-
LOSS, Ward vs McGlinchey a wash but you get Landry, none are stars
2019-Quinnen Wiliams vs Ed Oliver and Dalton Risner-
WIN
2020-Jeff Okudah vs CJ Hendersen and Jon Taylor-
LOSS
2021-Trey Lance but first non-QB Kyle Pitts vs Pat Surtain and Levi Onwuzurike-
LOSS
2022-Derek Stingley for Charles Cross and Ken Walker-
WIN
2023-Will Anderson JR for Jalen Carter and BJ Ojulari-This is really a
WIN but I can see the argument. But Anderson is elite, Carter is Very Good, Ojulari is a non-factor. Anderson is better than Carter thus a win.
2024-Drake Maye but first non-QB was MHJ Jr vs Rome Odunze and Kool Aid McKinstry-Based on year 1 slight win but call it a wash because early. Should have been Nabers at that spot and would be clear win
4 WINS and 4 LOSSES and 1 wash that leans towards a win.
The second trade is irrelevant to Hunter. The tackle class is meh, you can draft a tackle in the second round that will be a similar project to one at 21. Both guys will have second round grades. If you love someone and they work out then who cares about giving up the extra third which is like 25% Chance of success anyways?
All that said the reality is Hunter is a possible hall of fame level player, the Tackle at 9 is not even a likely pro bowl player. That's why you take Hunter. The gap from Hunter to pick 9 is enormous. I'd have to get a 1st this year, a first next year and a 3rd this year.