Not likely to be coincidence and it's a fairly well known side effect, as
@Art Of Flowers has already mentioned. Also have a search through the forum for a poll on other statins side effects from about 3 years back - it makes for some very scary reading!
I'd been taking statins for a number of years before i was diagnosed with type 2 at the end of 2013, and I wonder now if they were one of the things that helped push me into becoming diabetic. In the autumn a couple of years back I finally stopped taking them about the same time as I finally came off (also long term!) corticosteroid eye drops. I noticed a reduction of around 1mmol/l in my average readings shortly afterwards, and at first attributed this to no longer being on the eye drops, however some research told me these
don't affect glucose levels so I can only "blame" stopping the statins for this improvement.
Robbity
PS I have to laugh now, but at my first appointment with my DN, I said that I'd seen that statins could be implicated in diabetes - her reply "Yes, they're good for you!!" rather left me speechless...