I had a thought about this more and more, the rogue Changelings do not want Jack dead, but rather seem to be hunting him for something, I initially thought through fear but seems more like he has something that is make or break for them as they are wary around him and are avoiding killing him.
I keep seeing the nanoprobe theory around here and I wonder if the nanoprobes did something the Picard's spooge, not meaning his swimmers are robotic but have some sort of augmentation and this has been passed onto Jack who has some biological equivalent of nanoprobes where he can alter his cells at will, similar to what Changelings can do, ergo he is important to them as he holds the key to solids becoming shapeshifters naturally through evolution and the Borg have tapped into this and also want Jack to connect with them. Vadic and the gang do want Jack to connect because if the Borg get this ability and start reproducing naturally with it, they could destroy the Changelings.
I still there is an Armus connection with him being the one behind controlling them all on some level for vengeance of being cast off years ago and has infected them all to ensure he becomes one with them again.
I keep seeing the nanoprobe theory around here and I wonder if the nanoprobes did something the Picard's spooge, not meaning his swimmers are robotic but have some sort of augmentation and this has been passed onto Jack who has some biological equivalent of nanoprobes where he can alter his cells at will, similar to what Changelings can do, ergo he is important to them as he holds the key to solids becoming shapeshifters naturally through evolution and the Borg have tapped into this and also want Jack to connect with them. Vadic and the gang do want Jack to connect because if the Borg get this ability and start reproducing naturally with it, they could destroy the Changelings.
I still there is an Armus connection with him being the one behind controlling them all on some level for vengeance of being cast off years ago and has infected them all to ensure he becomes one with them again.