Please state the crime these five men were reasonably suspected of by the police officer as they were peacefully eating their meals. Suspicion of the crime must have happened BEFORE the officer demanded ID.
For reference, the Terry standard comes from a beat cop who knew his neighborhood and watched three men obviously casing a store over time. The Hiibel standard comes from a man who was reported to be assaulting a woman by the road side. This case involves men reported to be doing something perfectly legal -- open carry.
Stop and ID laws that didn't require specific facts leading to a reasonable suspicion of a crime have been struck down. The unrestrained power of the police to stop and question people has been ruled to be unconstitutional. Precedent and law are quite clear on this.
Disorderly conduct. That actually seems pretty clear as the stated reason for asking for ID in the various accounts.
The two complainants felt uncomfortable with the conduct of the men, which is apparently enough to suspect that they might have been disorderly under the law.
Whether they actually were or not.
Keep in mind that I disagree with what was done to the men and have never stated otherwise.