The frustration at Lewa becoming a Toa of Jungle has always rung a bit hollow, to me - the only solid case I've seen leveled against it is "it's a change to something I'm nostalgic for", but that's a limitation of the speaker, not a flaw in the subject. While having elemental power does feel like a core aspect of Lewa, I honestly don't see how having that power be plantlife over air diminishes him. Most of the personality tropes tied into Air also play well with Jungle, and hey, he's a green guy with an axe who swings from vine to vine and lives in a tree - does that say "air" or "jungle" to you? Seguing into the topic - since Jungle fits Lewa well, and Stone v Earth is... ehhhh, I'd be all for Pohatu becoming the Toa of Air. Think about it - besides sand, deserts are famous for their winds. Hot gusts, dust devils, the freezing nighttime breeze, ferocious sandstorms... That, and the sand adds a nice visual component to the wind. Pohatu, master of the scorching desert wind, Pohatu, master of the frigid midnight zephyr, Pohatu, master of the hungry sandstorm! I'd be all over that.