I've never said that Alan is near Galactus that I can recall. Normal levels Alan is Silver Surfer level and full starheart above that but certainly not Galactus level. Mordru wouldn't be Odin level (though close) and he can take on Alan full starheart or not. He was impressed that Alan wielded the starheart not troubled by it.
even Classic Fate wouldn't win vs Odin. The only version that does stand a chance of taking a few and MAYBE a slight majority (if absolutely everything went Fate's way) was the one story where Classic Fate merged with Inza Nelson to amp his power.