These are all interesting questions, but Space Marines are not the ones to answer any of them. They're more the 'genocide' guys.

Where...where are your shoes? Because that's weird. And just a tip, when Gadriel is the one saying you're weird...you're weird.

Either that or you're totally normal and he just doesn't get it.

"I am average for my kind. We never know how the surgery will go." The geneseeds do their thing. He was lucky that his chapter had the least problematic geneseeds, with few mutations. Didn't mean there wasn't some variation.