1990 had some big outbreaks including the Hesston, KS F5. 1992 had some big chases including the June 15th supercells over Kansas and Nebraska. 1982 was a big year with a major outbreak in OK including the Binger tornado. Those are just a few examples and dont forget the biggest tornado outbreak of all happened in 1974 with 148 tornadoes in one day. I think odd numbered years have nothing to do with it.
Weather patterns are far more complicated.
As for this year, i dont think it will be worse than last year. I honestly believe this year will have some good chases, but none of that belief has any science to it. In other words, you'll just have to wait to find out. When you say that BIG tornado chase seasons tend to happen in odd years, you failed to mention all the big chase seasons on even years. 1990 had some big outbreaks including the Hesston, KS F5.