Something like that. If you can't beat them, join them.
And even if running a pb at 32 was odd, what would it mean exactly? That he started doping at 31 or 32 and so was clean when he was robbed of the Gold by Kiprop and Ramzi?
He was 25 when he was robbed of the Gold in 2008, and ran 3:33 in Monaco in the same year. Maybe after that, yes. Starting around 2010, he literally improved every year instead of going downhill.
His later Monaco races:
2011: PR in 3:31 (age 28)
2012: PR in 3:30 (age 29)
2014: PR in 3:29 (age 31)
2015: PR in 3:29 (age 32)
In any case, I think one should disqualify proven drug cheats (like Kiprop) retroactively for life, and in doing so give Willis his long overdue Gold.