A zombie in a suit was in the Tower, when it was Lizzy's and Paul's turn to guard the cameras. At that time Kelly was part of the Tower-citizens.
Lizzy, Saul and Burt also recognized the suited zombie during their oil-rig-mission, which took place when Kelly was part of the Tower-folk as well.
Although both situations were only offered face-value to the audience, it is not unlikely that Lizzy and others talked about the suited zombie after these events.
In the hospital Kalani and Riley encountered the suited zombie; and Riley is not half as secretive as anyone else on the show; so it is quite possible that she talked about it with others, who might have shared this information with others as well.
Then don't forget that "Ink" was pretty present in the Colony, when the survivors defendet the COlony from the swarming zombos with Ink/ the suited zombie doing crazy intelligent things all the time ...
All assumptions, I know, but far from being a stretch in my opinion.
So I think that all the main characters have a similar understanding about who the suited zombie is. Kelly knows about him like Tanya does, although Tanye might have a much better understanding of him, because she dug through the logs of all the people ... So, about Ink or TOWTM or the suited zombie there already is a common sense within the group of the main characters at least - at least I think there is, because I hold it as kind of unlikely that they still did not make up their mind about him yet.
Best wishes!
Liam
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