I don't know if you wanna do abyss anytime soon. Other than that piece of content, there's not really any other justifiable reason to awaken a torch with a gem. Also congrats on having both ghost and quake as 5*s!
Use it on who you enjoy using. I’m personally not a fan of “save something till you pull x champ”. Because you may never pull that champ for that class. Then you go down a rabbit hole of not using any resources till you get a specific champ. Furthermore it adds to the frustration of not getting that champ through RNG crystals.
Human Torch does not need his sig. It is literally useless.
At max sig I get my prefight ability back every other fight, low sig it can take 5 or 6 fights to get it back. Max sig on Torch is very useful imo. I have Cap and Torch R5 200. Both amazing champs. Since no Cap I would awaken Torch and start getting his sig up.
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Also congrats on having both ghost and quake as 5*s!
If you like HT, use one. You have two.