Fun set of questions:
1. Definitely the Tennessee games were much bigger that this. And I would say that a couple of the Baylor games during Griner's time and definitely the ND games during the last 6 years. And probably Duke in the years when they flirted with the #1 ranking with Beard. The famous game in Cameron. And I guess South Carolina as the #1 seed in our first meeting. And Rutgers in the Cappie days. (And of course the game that never happened is probably the biggest of all - the Uconn/TN game that didn't happen because Pat cancelled the series.)
2. The obvious correlation is to the 2002-03 team which no one believed could continue winning and yet went undefeated in the regular season, lost in the BE tournament to Villanova and then went on to win the middle of the threepete. But you could also say the 2012-13 year when the big three were freshman but couldn't beat ND or Baylor and didn't get the #1 ranking until the final season poll. But for 'low expectations 2002-3 and this year are tops for the same reason - 2002 graduation of Sue Swin Tamika and Asjha - all taken in the first 6 WNBA picks, and 2016-17 with the big three going 1,2,3.
3. Agree with Alex and Wally - TASSK - Sue Bird was the bottom of that barrel as Kirsten was expected to be the replacement for Rita and Sue to be a nice back-up plan. And the class of Maya and Lorin, and the triple class of Stewart, Tuck, and Jefferson were both seen as pretty special. (Maya was so highly regarded that PS went ballistic.) And while it didn't turn out that way, the class of EDD, CD, TH, and HB was anticipated in the same way.
4. The only two that come anywhere close are Kalana Greene and Tiffany Hayes - KG pre knee surgery is only a vague memory now, but she was lightening quick and a good leaper and played a similar undersized post position. Tiffany Hayes won a national SPAARKS competition in HS, has speed, arial ability, and the same ability to finish near the rim against much taller competition - still remember her driving int0 Griner a few times with success. But neither comparison is great - Gabby's vertical must blow both of them away. The final comparison I would make is to Moriah! We don't think of it because she gives up another 4-5 inches in stature to Gabby and an added 3 or 4 inches in arm length, but Moriah might actually have a greater elevation from the floor, has more speed, and could do the same kind of miraculous fronting of much taller post players - she had a couple of steals of entry passes into Imani Stafford that remind me of Gabby's work this year.