Haikai Thoughts (on Senryu)

Im starting to believe that #senryu is what Haikai poetry was all about without the overemphasis of including/mentioning a season/seasonal phenomenon...I remember a scholar (not sure if it was Henderson, Blyth, Shirane, or Sato...maybe even Makoto) who mentioned how the 'kigo' technique hardened into an inviolable rule. Knowing that in 'Kosenryu' (old senryu), it wasnt that kigo wasn't EVER present, it was that inclusion of a kigo wasn't required. It wasn't a law, so-to-speak. The lifeblood, focuspoint of senryu have always been people/psychology/human impulses/emotions/work etc

I believe this in part the essence of Haikai as a genre. I read in a book I have on the collected senryu of the Rokudaika (6 masters of senryu), that Haikai wasnt a unified practice but was made up of many schools and philosophies with different thoughts. But Haikai was a reaction against the strictness of the Shoganate and poetic conventions that remained in the hands of aristocratic poetic families and it's unnatural focus on courtly elegance and the sublime.