Technique is just a guy whose original username was Phenomenol. He's been around for years, they keep banning him and he keeps coming back so they just stopped caring.
Before Shirohige was shown doing anything, he was a super Pro - Shirohige guy… "Shirohige will own this" or "Shirohige will own that". He's a troll, but he's harmless.
Personally, I've enjoyed this war. It's a fresh change of pace from the adventures of the main crew; it's nice to see Luffy interact with old villains and new allies. Plus, we got our first undisputed death in present time, and it was an extremely major character. It's one thing to have the character's Sensei die; that's all too common (Yuyu Hakusho and Naruto, to name two), but having the main character's blood brother die? That's a bold move in a long term manga, particularly a Shonen.
Also, people bitching about the New World Pirates being crap and us having "seen it all", remember, there's 3 other Yonkou crews (We've seen a little bit of Shanks' crew, but not in true combat), a beast of a man Kaidou (If he can fuck Moria in his prime up, he's gotta be a brutal beast), and the unknown, crazy looking Yonkou. Plus, we have Gyojin Island, Elbaf, Wano Country (Fuck, Wano Country has Dragons and shit. It's gonna be on when the Strawhats get here. I'm REALLY looking forward to this place), Lola's Mom, Ebb Ward (24 years ago, this was a battle zone among the top pirates in their prime. Now it's probably an all-out slaughter between New World Pirate crews), and ultimately Raftel.
Yeah... We still got a lot of good shit to look forward to.