Does it make sense that all my hair under my chin is double follicle?

I looked at several articles about head hair transplantation from the beard and it is written there that because the hair in the beard is single grafts it will not look good, if my hair is mostly double (the one under the chin) will the results of the transplant be better? I just happened to think about a second transplant in the future
another question: I'm after the first transplant the results from sorting the grafts looks good ? how it is possible that I have a graft with 6 hair? and 5 hairs?
https://www.baldtruthtalk.com/attach...&thumb=1&stc=1
Thanks!