How about a little logic and experience in this discussion? After my surgery in march, my glans did not engorge as easily as it did with Tri mix shots. It has noticeably improved over time. Your level of arousal and your physical position (I.E. Standing or on your back) also contribute. We come to these surgeries for many different reasons. Those of us who needed help with blood flow prior to surgery obviously will have less flow to the glans when we go bionic as opposed to shots. It stands to reason that if blood flow was an issue prior to surgery, and you cram two pieces of plastic 2/3 rds of the way into your glans (thank God for that...it's where it needs to be) then you have likely restricted blood flow a little further. So I also noticed that it felt cooler than surrounding tissue. That is no longer the case.
In my case as my healing became complete and my sex life got rolling again, the blood flow to my glans has improved to where I don't really notice it anymore. Good oral sex during foreplay is also a big help with glans engorgement. A living VED if you will

Age 75 Implanted by Dr. Andrew Kramer 03/22/2017. AMS 700 LGX 18 CM with 2 Cm RTE for a total of 20 CM. Previously used injections over 1000 no scarring