They did. They mentioned earlier that they tried to get in touch with Arrow and Ronnie, but they were hard to reach. Them showing up late when they did was presumably fortuitous timing.

Well if he has the knowhow plus materials PLUS superspeed, then yeah…that actually seems plausible.

They covered that. They mentioned earlier in the episode they tried to contact Ollie and Ronnie, but Ollie was in Nanda Parbat(I'm guessing this episode takes place during the Arrow episode TWO weeks ago, when Ollie came to Starling to get Nyssa, maybe making a detour for Barry) and Ronnie hadn't replied yet, so I…

They may not have the "right", but they may have the responsibility to make sure there's measures in place for things that they know to be a potential threat. And the Index is basically tantamount to expecting a gun owner to be registered so that their weapon can be traced to them if it's used in a crime, no?
Also…

One thing I don't get about the Inhumans (well, there's more than one thing, but this is the big one right now)…WHY do they make other people Inhuman? Because if they want people to keep their powers secret, that means they can't be allowed to use them in the outside world, and if they can't do that, what's the point…

"I'm not sure about this….are we trying to say that hacker duties are less important than carrying a gun and going after the bad guys? Someone needs to do the hacking."
THANK YOU. This is a rather odd criticism that seems implied a lot when you hear actresses talking about the roles they place in films or TV series…

As noted, physicality is often NOT the point of a lot of Batman's rogues, so age doesn't matter, but even saying that…older people CAN still be physically imposing. Liam Neeson is in his 60s (which means he was in his 50s when he played Ra's Al Ghul)and is a bona fide action star now.

This show's gotten better every week and this was no exception. One thing though: Karen Gillan's ALS Ice Bucket Challenge video had her, Cho and Kevin's actor all dressed as Power Rangers in it, and when they made the reference tonight I expected this was when we'd see that in an episode, but no such luck…

Major improvement from the usual due to the Regina focus. The Darlings appearance was kind of a weird one because it meant that two brothers had to pose as a couple for, well…however long it would take for the agency to approve them as parents, and I hate to imagine all the sorts of incestuous method acting they'd…