I'm not sure what a "certain type of suspect" might indicate beyond the photo and voice of who LE believe to be their suspect and who they're asking the public for help in identifying?
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That he brought them back or left them at the crime scene is part of the profile as though he wanted them to be found. The COD. 2 girls is part of the profile. Broad daylight. The type of weapon. SA. Level of violence. Alot of things, it's quite a science to come up with the profile of a killer. But the experts determine if it's one person or more, young or older, incited by the violence or by control or sex or even if it fits the profile of a gang hit or attempt at sexual trafficking gone wrong.
They could develop all of this and have someone totally in their sites but if that person has an alibi they need someone to provide testimony that puts them at the bridge at that time instead of where they said they were, so they need to ask for the person who recognizes this one guy to come forward and do the right thing.