Either claim the guy or don't, but don't imply. It is the kind of statement someone would make who was trying to get people to think he has more power/influence would make. I mean if the guy really is your source you do one of two things:
1) Keep shut up about it. You decide that you want to protect his family, friends, information, whatever. So you say nothing and deny everything. You try to convince your adversaries that this guy was just another guy, someone you had no involvement with.
2) Publicly and unequivocally state the guy was your source. You decide it is more important that it now be known. Maybe you feel there is no threat to anyone else, maybe you want to honor his work, maybe you feel it will help bring the people who killed him to justice. Whatever the case you make it very clear that yes, this person was your source and probably even identify some of the information that was theirs.
There is just no way that some kind of half-assed insinuation helps you if he really was a source. It doesn't do any good in terms of verification, but still could be used by an adversary as enough of a conformation to then go after others.
However it makes a lot of sense if he wasn't a source and you are a full of shit attention whore. You get to make news, get people thinking "well it could have been his guy!" but then if it comes out he wasn't, you can deny everything saying "Well I never claimed he was a source, just that his murder was for unknown reasons!"
To me, it seems that Assanage will say pretty much anything these days to get himself in the spotlight and hence this wishywashy crap. He needs to knock it off. If the guy was a source, come out and claim it in unequivocal terms, or just say nothing. Don't insinuate.