When exactly was it delivered to his house? Common sense tells me to ask these questions.
Or really, it could have something to do with his wife recovering after child birth (since we don't know when in 2011 it was delivered ... please share a date when it was delivered to his house so I can clear that up ...). Common sense tells me to ask questions about that. Also, that stems from an inquiring mind and the desire to see different sides of a story until I have a solid foundation for which to discuss things on or actual, proven, detailed, fact is given. Also, it stems from not being partial to this or that team or hating one team or another which would cloud my perception.
I don't know anymore than this as fact ... Manning went public about the allegation, didn't deny HGH being delivered, but was irate that someone accused him of using it. Tells me that, depending on the still unknown actual date, that his wife could have actually used it and he doesn't want everyone and their brother to know the reason, especially if it involved post pregnancy complications.
Also, another fact ... 55 TDs for Manning came in 2013, not the ensuing 2012 season (I'm assuming you meant the season after 2011 when you said ensuing).
.5 psi ... interesting comment seeing it hasn't been mentioned until this point ... Patriots fan???
Truly pure HGH, not mixed with anything else, should be allowed for recovery, as should a difference in PSI depending on air temperature ... However, there are rules written for both.
Ummm, HGH was reportedly banned by the NFL in 2011 which means it was prohibited that year ... However, in good 'ol NFL fashion they didn't begin testing it strictly until around 2014.
Age can be a factor for a decline in performance. Trying to throw a football at near 40 after you've done it for 25+ years (18 in the NFL) is not easy. Yet Manning has continued to perform at a high level. Since we're on declining stats ...
2011 = HGH prohibited ... Manning didn't play in 2011, 37 TDs in 2012 (2nd most for a season in his career at that time), 55 TDs in 2013 (most in his career), 39 TDs in 2014 (now 3rd most in a season for his career), and 9 TDs this past year when he was injured the majority of the time. Please explain how his stats fell dramatically or much less declined since the 2011 HGH ban ... 2015 foot injury season that kept him out for the majority of a season is not a valid season in the discussion