[Sunred]

So just realized the reason why 80, Neos, 21, Great, Powered, and Max are being highlighted in UGF:TAC; it is their anniversaries this year. One thing to consider is while Great actually is a 1990 show and Powered a 1993 show, both of their Japanese dubs aired in Japan in 1995. So by Japanese broadcasting year standards:

Ultraman 80, 40th anniversary
Ultraman Great and Ultraman Powered, 25th anniversary
Ultraman Neos, 20th anniversary(Ultraseven 21 is the secondary ultra of the show)
Ultraman Max, 15th anniversary

Oh and fun fact, Kane Kosugi who played Jiraiya/Ninja Black in Kakuranger was protagonist Kenichi Kai in Ultraman Powered and Kunio Masaoka who was Shohei/Oh Green in Ohranger was one of Ultraseven 21's(read as Two-One) many disguises in Ultraman Neos. And Jun Takatsuki who was Satoru/Kamen Rider Tiger in Kamen Rider Ryuki was Genki Kagura/Ultraman Neos in Ultraman Neos.