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.