How past cameos work on Gokaiger so far

It has come to my attention that some fans don't watch Gokaiger and are a bit confused as to when these cameos of past Sentai heroes happen and how it works. So far there doesn't seem to be a pattern for the movie but there does seem to be a clear pattern for the series itself. Let's look at the series itself, mind you this is just a theory and it is subject to change or have variations. Fans believed at first it would just be one hero per series to appear in one episode but it seems to be random numbers, because it varies on the availability of the Super Sentai alums. Some have more open schedules than others. Because all past characters have no powers now, they only appear in human form. This can have more leeway when adapting it into Power Rangers, as they can get any actor available and it doesn't have to be the same color.

Episode One had the Legend War, no actors were actually seen. Many past suit actors reprise one of their roles.

Episode Two saw a brief cameo of Aka Red, a character introduced solely for the 30th anniversary in Boukenger VS. Super Sentai. He appeared in a flashback but we don't see his face.

Episode Three saw our first Sentai alum. Atsushi Hashimoto as Kai Ozu, his sky saint Frajel made a cameo. Kai taught Don about 'Courage' and they gained the Magi Dragon. They saw the MagiRed helmet appear superimposed over Kai. Episode 4 was a Gokai Blue episode and had no alum or past power.

Episode 5 saw three returning Dekaranger. Doggy Krueger's suit actor and voice actor returned and he was in the majority of the episode. Jasmine/Deka Yellow made a cameo in the beginning and Ban/Deka Red made a cameo at the end. Marvelous say Deka Red's helmet appear superimposed over Ban. They received the Pat Striker and made Deka GokaiOh.

Episode 6 was a GokaiYellow episode and had no old power or alum, some believe it had Kamen Rider references. In Episode 7 this Sunday in Japan (Saturday for us), Master Shafu and Jan are set to appear. The GekiBeasts are set to come out of GokaiOh but no new formation will be made as there is no toy.

GaoRed's actor Kaneko Noboru confirmed to appear in Episode 9 for when the Gokaiger gain GaoLion and form Gao GokaiOh. Above is an old photo.

So for the series, it seems that one episode they have a alum, gain a new power and the next they don't, a ranger-focus episode. Most of the alum episodes do have ranger-focus too. For example, Episode 3 where Kai comes in, it is Green's episode and Episode 5 was Red focus. And Episode 7 seems to be a Pink/Green focus. It seems that with past alums, it doesn't matter how many there are but there has to be at least a Red one. Let's see if they break this rule later on. Because if Ryou (Ryuuranger of Dairanger) is appearing in the movie, I wonder if he will also appear in the Dairanger-focus episode.

As for the Movie:
The Goseiger team up with the Gokaiger. But there seems to be a special appearance by Genta, Chiaki of Shinkenger, Saki of Go-Onger and Akashi of Boukenger. Since the Goseiger have their name in the title of the 199 hero movie, it is safe to assume that this will serve as a Gokaiger vs. Goseiger and there will be no Gokaiger vs. Goseiger teamup.

Oume, Ryou, and Umeko are set to return for the movie too, I think they are just quick cameos.