Guy whose team went from 13 losses to 13 wins is like, "Do you think it's even possible that your team could improve as much as mine did?"
In point of fact, the existence of the 2025 New England Patriots (and the 2024 Commanders, and the 2023 Texans, etc.) makes me think that any garbage bottom-feeder team can dramatically improve in one year.
You left out the 2008 Dolphins. With sufficient cap space a team can improve dramatically.
The 2025 NEP started the season with the second or third most cap space in the NFL. Regardless of what you do with Tau, the Dolphins doesn't have the cash to improve the team, in fact they are going to be worse off in 2026 than 2025 regardless of what is done with Tau.