On the my profile page ingame, previous season rank shows as season 10 for me and many others. Dont know why because i have seen others listed correctly as previous season 'Christmas'.
Also could best season not be based off of total trophies in one season and more on rank placement? Doing it off of trophies does not equal best season. You could get 5001 trophies and finish legendary 4 one season and get 5000 and finish 1st and the legendary 4 would be considered your best season.
Would this be possible?
Edit: removed the tag to Carlos as he is Monster Design not multiplayer