You seem to have a rather restrictive definition of "State Flagship," even going so far as to disregard a few schools designated as such by their respective states.
I won't go into that about the schools in question now. Instead, I would like to speak in hypothetical terms, about schools that only exist in alternate universes and university developments that may happen in the future but haven't happened yet. Would you regard any of these schools to be state flagships? (I will not say whether or not their states in question regard them as such, I am asking your opinion)
1. North Carolina Insititute of Technology(Greensboro):
Formed in 1965 by combining the would be University of North Carolina at Greensboro (Historic Women's College) with North Carolina A&T University (1890 Land Grant School). Both of these schools have a pre-twentieth century origin. Statewide Mission as Space Grant University. Engineering School Better Regarded than N.C. State (at least in terms of producing engineers, if not research) Home of joint rural medical program with ECU. Based on the combined student bodies of North Carolina A&T and UNC Greensboro in our timeline, has a larger student body than N.C. State. Part of a Research Triangle with High Point and Wake Forest.
2. Texas State University Main Campus(Denton):
Formed in 1969 from the Merger of North Texas, Texas University for Women, and the Historically Black Texas College. Posesses Law and Medical Schools. Joined the Sowthwest Conference in 1976, and the Big Twelve in 1995 (replacing Baylor, who went into Conference USA). Based on the combined enrollment figures of those three schools, posesses ca. 55,000 students, making it larger than U.T. Austin or Texas A&M at College Station.
3. Idaho State University:
There are currently talks of basing Idaho's proposed public medical school in Pocatello. With that medical school, plus a larger student body than University of Idaho, would you consider it to be a flagship, or not?
4. Tennessee State University:
Someone rich dies and leaves Tennessee State the Sum of $2 Billion, which is then used to build, among other things, law and medical schools, a research farm complex in Hermitage, completely revamp both the main and downtown campi, and boost enrollment to between UT Knoxville and MTSU levels while building a research base comparable in town to Vanderbilt.
5: Massachusetts Commonwealth University:
Formed in 1969 from the merger of Boston State, UMass Boston, and a Boston University that was taken over by the city in the Nineteenth Century during one of its bankrupcies. Posesses on campus medical and law schools, (UMass' med school is in Worcester and Law School is in Lowell) has a student body nearly twice that of UMass Amhearst, plays hockey and basketball at Boston Gardens, and share Gillette Foxboro Stadium with the New England Patriots.
6. Florida Tech University(Orlando):
The University of Central Florida isn't given its present name, and its grad school and research facilities in Melborne aren't sold private. Remember, it is one of only two undergraduate colleges specifially founded as a Space Grant School (The other is Alabama-Huntsville)
7. Pennsylvania Commonwealth University:
Either Indiana of Pennsylvania or Callifornia of Pensylvania get a law and medical school before Penn State grows really big, or else Lincoln of Pennsylvania gets renamed.
8. University of Pennsylvania:
Instead of taking Temple under the state's wing as a State Related university, it is UPenn having financial difficulties and is rescued in the 60s.