Let's start with the iPad. First iPad was called the iPad. Awesome start. The second, the iPad 2 ... even better. The third was not the iPad 3 but rather the iPad ... or the "all new ipad" aka 3rd generation. Starting to lose it a bit here but let's trust Apple. The iPad 4 was not the iPad 4 but actually the iPad ... with retina display/4th generation. Ok so maybe we're starting a new naming scheme? Good then. The 5th generation iPad is/was called the iPad 5th Gen... oh wait no it's called the iPad Air.
To top it off, the 3rd and 4th generations are discontinued, leaving the iPad 2 and the iPad Air as the only available models. Try explaining that to a non-Apple following family member and watch their face contort.
Now I did RTFA and was amazed at how the author could spin the atrocious naming scheme for the iPad into something that matched his hypothesis. Kudos to him for sticking with it.
This snippet taken directly from the article could almost prove my point
"The original iPad hit store shelves in April of 2010, soon followed by the iPad 2, which was released in March of 2011. When the third-generation iPad was released in March of 2012, Apple by and large decided to forgo the numeric naming scheme and instead advertised the device simply as the all-new iPad.
Instead of a scenario with the original iPad, the iPad 2 and iPad 3 floating around, Apple kicked numerical suffixes to the side and started anew. When the fourth-gen iPad was released, Apple, again, didn't refer to it as the iPad 4. Rather, it often began referring to it as the iPad with Retina display."