Thank you for reverting the edits on Shou Ronpo and Tsurugi Ohtori which erroneously stated the latter was the Sixth and not the former. If I had $1 for every time I had to explain to someone why Shou is the Sixth, I'd probably be rich by now. He was the first to join the team after the core 9 (confirmed by Toei) gathered; His suit is similar yet slightly different than the others. His morpher is different. His Kyutama is numbered lower than Tsurugi's (and Kotaro's too). Ryu Voyager is similar to the others functionally. And that's just the tip of the iceberg as to why Shou is the Sixth and not Tsurugi. Thank you again for making those reversions.
No problem. I'm in the same boat myself, because as you said Ryu was the next Kyuranger both appearance-wise and numerically speaking (like DekaBreak, the Go-On Wings, Kyoryu Gold and Zyuoh the World). After all, 10 comes after 9, just as 6 comes after 5.
Exactly. I mean, I could go on - no rule saying mentors cannot be the Sixth (PR has a few of these), someone once tried to convince me that since Shou is Purple that he cant be Sixth, and so forth. And no one has offered any real proof, just saying Tsurugi appeared around when other Sixths generally do. Which is true, but look at the last few Sixths - Kyoryu Gold and StarNinger being two notable examples. The Sixth appearing before episode 17 isn't unheard of, especially recently. If we wanted to get technical, that would make Kotaro the Sixth, not Tsurugi!
And yet we had ToQ 6 gou and no one complained about him being an orange sixth. No reason why purple/violet or any other colour can't be a sixth. The Green Samurai Ranger from Ninja Storm is good way to compare with Shou, in that he was there from the get go but didn't join the team until later in the show.