Flynn is the owner/creator/Admin of the Grid itself. He can create/delete/edit any programs he wants. He has ALL the keys/privileges there.
Clu is effectively the Grid's Co-Admin -- he's a digitized program of Flynn himself, designed to build the "perfect system". However, Clu's Admin privileges are 'restricted' in the sense that he cannot create programs, and has to corrupt/rewrite/edit the Grid's preexisting programs instead(that's how he reprogrammed Tron/Rinzler, assembled his massive army, and presumably how he planned to enslave the Earth as well.) That said, Clu's ability to repurpose programs to suit his own needs > Flynn's ability to create them; hence Flynn's statement: "Clu fed on my resistance. The more I fought, the more powerful he became. It was impressive, really." That's why not even Flynn himself could beat Clu while inside the Grid -- his only option was reintegration, which seemingly killed them both.
I'd say Tron has Global(possibly low-level Admin) privileges. However, his primary purpose is to protect users(ie. real life people) who enter the Grid from harmful programs. He's essentially a [very] high-level security program(akin to Seraph from The Matrix.) Within the Grid, it's basically: Flynn/Clu > Tron > ALL.
But if you've ever watched the original film and/or Uprising(which is also phenomenal, btw), you know there are/were some other, very high-level, programs within the Grid(such as: MCP, Yori, Ram, Sark, Dyson, Tesler, etc.)... But that's neither here nor there, and an entirely separate nerd-rant. 🤓
**On that note(and as much as I despise Jared Leto), I will absolutely be seeing Tron: Ares opening day... Been waiting YEARS for a continuation of Legacy. Next on my bucket list is a continuation of the 2012 Dredd film. droolio
Morrison is returning to the big 2 again. Hopefully, it's the Legion
https://bleedingcool.com/comics/grant-morrison-returns-to-a-big-two-superhero-comic-but-which-one/
Superboy(Kal-El) Vs Validus(looks like is the original version, a toddler inside a monster body, and Kal mentions he fights him with LoSH)
https://ibb.co/PZ3jpsF5
https://ibb.co/gbhD3bgs
https://ibb.co/DPX6Kmbn
https://ibb.co/7dNh0Lrn
https://ibb.co/PGr0ZqLc
https://ibb.co/77JvWRb
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https://ibb.co/ch7WqfCk
Superman Vs Validus
https://ibb.co/9kvJvjpT
https://ibb.co/fdhbrw02
https://ibb.co/274f07fB
https://ibb.co/0y61fyXr
https://ibb.co/ksFS8kyq
https://ibb.co/PGw3XZGr
And here is Darkseid's LoSH, apparently, this Lightning Lad can hurt Validus to some degree
Also Booster Gold
https://ibb.co/jvQdpj77
https://ibb.co/TxCGjkMy
Huh, So Grodd needs Kryponite to weaken Superman enough to change the bodies.
And once inside Superman's body, he is able to catch a speeding Flash, even though Superman's body was weakened by Kryptonite moments before
https://ibb.co/8nJxSMPQ
https://ibb.co/Z6ymzdBL
https://ibb.co/TxbTdQJy
https://ibb.co/mCpx0s76
https://ibb.co/sv13q0bx
https://ibb.co/b5RkPtrR
https://ibb.co/pvZrJ6j6
https://ibb.co/PZ4YyHqW