[MattEmily]

actually it was never said in-show that Zordon was the one that sealed Rita and her minions away... although more than likely he was the one that did it... however you do have a point that at least he did explain his reasons but technically so did Gosei the only difference between the 2 is that Zordon was actually familiar about the villains so he could assist the team when they had issues however Gosei wasn't as familiar with the villains so he couldn't do much to help out.

Terra Venture only had the Lights of Orion and the Galaxy Book. The Rangers were the ones that had the Quasar Sabers.

Captain Mitchell did have a personal connection to the demons but technically Lightspeed Rescue was set up to deal with the possibility of the demons being released.

Time Force was responsible for dealing with the capturing of mutants and it was Jen's decision to decide to follow Ransik to the past along with her team because she felt responsible for letting him get away.

Wild Force really didn't have much of a reason other than the Ancient Warriors and Animus fighting the original Master Org years ago. Cole and the new Master Org however did have a connection.

Ninja Storm had the whole Scroll of Destiny thing where everything was destined together with Sensei's brother; Lothor returning and then eventually the Wind Rangers would have to face him in a final battle.

Dino Thunder had the connection because of Tommy and Trent's connections of Mesogog.

S.P.D. because of Cruger and Gruumm.

Mystic Force really didn't have any connection except when it came to Koragg.
Overdrive because of the Corona Aurora and its jewels.
Dai-Shi's only connection was Jarrod and because Dai-Shi had been trapped in a box held by Phai Zhuq the Order of the Claw.

RPM because Dr. K likely felt responsible for creating such a deadly virus.
Samurai and Megaforce there's no reason for it. Also no connections either.