Speculation about Martin being the source from whom the Brokers obtained the exploits was fanned by American freelance reporter Kim Zetter in an article published by the website Politico in January.
In that article, Zetter claimed that Martin had communicated via Twitter with researchers at Russian security firm Kaspersky (then Kaspersky Lab), who had then tipped off the NSA that he might be worth investigating.
Martin faced a total of 200 years in jail — 10 years for each of the 20 counts against him — but his lawyers reached a plea deal with the US Government to keep it down to nine years in all.
In Pho's case, too, there were hints that he might be a link to the Shadow Brokers. At least one media report claimed exploits from Pho's PC had been exfiltrated by Russian hackers who then released them, either through the Shadow Brokers, or by themselves under the same name.
For nearly three years now, the NSA's counter-intelligence arm, the Q Group, and the FBI have been investigating to try and find out how the exploits, created by the NSA's Tailored Access Operations group, leaked to the outside world.