Now before I get deep into this let me just say that first to my knowledge only three wrestlers are working for ROH without contracts. The second part of this is that they have contracts with ROH just not exclusive or written contracts with the company. This means that certain talent have just a verbal agreement with the company as oppose to the more traditional written contract. To get more specific with the names of the talent that don't have official contracts with the company they include the ROH World Tag Team Champions Rowe & Hanson (aka War Machine) and "Unbreakable" Michael Elgin.
Now from I did a few months ago regarding the contract status of Michael Elgin with the company I do know his most recent contract was signed with the intention of him being more independent from ROH. This also gives Michael the ability to control his dates. An interesting item to note is that Elgin won Survival of the Fittest back in November and not only became the first person to win two Survival of Fittest titles, but also became the #1 Contender to the ROH World Championship. His title is currently set to take place at Wrestle Kingdom 10 on January 4, 2016 live from the Tokyo Dome, that's right Elgin's title shot is happening in Japan.
Ask for War Machine they just won the ROH World Tag Titles at Final Battle around two weeks ago which seems a little strange to me, because of the fact that they could pull a Kenny King and leave at a moments notice. This is a test in loyalty and trust on the part of both parties. The fact that they won the titles isn't a shock, as I expected them to win the gold eventually it is more that I didn't know their contract status which makes it a little more surprising.