ISOGG tree and the Nordtvedt trees (see in particular this one for your question) to understand the SNP relationships.
As I understand it, CTS616 is a common SNP in I2-M223 (called I2a2a in many more up-to-date nomenclatures but called I2b1 in the stagnant FTDNA nomenclature). It ties together I2-M223>CTS10100 (nicknamed "Cont"), I2-M223>L1229 (nicknamed "Roots"), and I2-M223>M284 (nicknamed "Isles"). Those three groups are by far the most common I2-M223 subclades. So hopefully it's all clear now that M284 is downstream of CTS616, and CTS616 is downstream of M223.
M223 Project at FTDNA and see where they classify you.