Well my friend, thank you for making that simple for me.
I'm going to have to respectfully disagree with just about everything you wrote though. And excuse the ng typo.
Surface area and volume of bloodflow of a muscle will have an effect on the assimilation time. And to partially use your analogy, here's another example: hgh subq peaks slower than im, as does hcg sq vs im (your example), as does test sq vs im *so I've read, not positive on this TBH. But I'll go out on a limb.
Can I ask your background and stats? (Asking for real, don't get offended. Already said I am no doc or scientist).