It doesn't really matter if you fuse him or not you can buy him again from the persona compendium in the velvet room and as for him learning new skills you can use skill cards to have many skills from higher-tiers to him such as bufudyne and megido, i have Izanagi at lvl 46 with high skills. but if you want him to be at the same lvl as when you fused him then register him in the compendium or other wise you'll get him as lvl3 from the compendium. I hope this helps :D
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