There are more links.

First, the style of communication on all these coins is quite similar. The developers are absent for days at a time or longer, then make very short posts with questionable (at best) English writing skills. They don't really interact with the community so much as show up occasionally and make prepared statements, then disappear again. (BTW, this reminds me a lot of TFT.)

Second, we know of bought accounts being used for both bytecoin and quazarcoin.

Third, there are major stylistic similarities between all of their web sites. For example, look at the icons used for their download links:

bytecoin.org:



quazarcoin.org:



fantomcoin.org:



monetaverde.org:



old bitmonero.org:



I thought maybe this style of download links was extremely widely used and this could be a coincidence, so I looked at several other coins that are reasonably "hot" now, including DRK, CLOAK, and XC. None of them used this particular style of download links.

In my opinion all of these cryptonote/bytecoin coins (except Monero) are being run out of some kind of coin mill, probably operating in a country where English is not widely used. The public-facing "developers' are really just caretakers who divide their time between appearing to be working a lot of different coins under different names. The web design is done by a common team, which explains the stylistic similarities (close attention to the web sites would probably show more such similarities).