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Show me this evidence. I have provided evidence already of quite a few top coaches that became proven coaches, but they had a lot more experience than what Pruitt has when they became proven. When they actually won something of significance.
Most of the coaches you listed at the college level prove exactly what I'm talking about. Your NFL coaches can be entirely thrown out the window, as they are vastly different jobs. I also am not counting their assistant coaching tenure. This is about being the head guy. These guys, off the top of my head, are current top coaches or have been at the top in the last 15-25 years. Not a ranking, just the order I am listing them in.
1- Saban - Michigan State hadn't had a winning record in 5 years, and had just gotten NCAA probation when he took over. In year three he beat #2 Ohio State (much to our delight) and a highly ranked Notre Dame team. 9-2 in year 4. Year 3 at LSU, SEC Title. Year 3 at Bama, NC.
2- Meyer - took over a 2 win Bowling Green team. Won 8, then 9 games his two years there. Utah 10 wins then 12-0 in two seasons. Florida year two NC. Ohio State 12-0, 12-2, NC first three years.
3 - Dabo - 10 wins by year 3.
4 - C. Kelly - AP Coach of the year by year 2.
5 - Franklin - Vandy in the top 25 two times in his first 3 years.
6 - Brian Kelly - took over 4 win Central Mich, 9 wins by year 3. 10 wins in year 1 for Cincy, Big East title by year 3. Notre Dame year 3, NC game.
7 - Dantonio - first coach in 23 years to have winning record at Cincy in his short stay there. 11-2 in 4th season at Michigan State.
8 - Fisher - FSU lost 6 the year before he took over, 11-2 his 3rd year.
9 - Bob Stoops - National title by year 2.
10 - Carroll - 12-1 year three, started 34 game winning streak.
11 - Tuberville - SEC COY year 3 at Ole Miss, Auburn was 3-8 the year before he got there, 9-4 in the SECCG by year 3. 13-0 a few years later.
12 - Richt - SEC Championship by year 2 at Georgia. 10 wins year 2 Miami
I can keep going for a while and I'm sure I missed plenty, but these guys and many more got it rolling quickly at every stop they make. If you can find even a dozen guys who are remotely recent successful head coaches that struggled for their first 6 or 8 years as a head coach then turned it around, I'll be stunned.