AAP vs ORLY - auto parts and earnings cyclicality

I was looking into AAP - and its competitor ORLY - and I noticed a strange pattern in the earnings.

AAP has the reverse cyclicality of ORLY, even though they're in the same sector. AAP tends to have its peak earnings in Q1, which is followed by decreasing NI throughout the year (until the next Q1). Meanwhile, ORLY has steadily increasing NI from Q4 to a peak of NI in Q3 the following year. AZO is similar.

Can anyone explain to me why AAP is reverse to other auto parts suppliers? I thought in general auto parts sellers would follow together.

Submitted October 29, 2014 at 09:56AM by Iamchinesedotcom http://ift.tt/1p1mHE3