Yes.That makes sense. But I took Dash unknowingly commenting on each pony's abilities and mentioning "somehow knows what's going to happen ahead of time" as Pinkie's reason to be there. I mean, do you really think they'd be as sinister and petty to sabotage the construction of a new building to quell Dash's ego?
It was just a repeated string of disasters because that's the only way the episode would work, even assuming they were staged, there were a lot of legitimate ones before that. I don't think the other ponies staged it, but they were there on the same happenstance that Dash was there as well.
Child in a well was a legit Dash rescue, not prevented by Pinkie.
Baby stroller rolling off a cliff was a legit Dash rescue, not prevented by Pinkie.
Balcony collapse was a Dash rescue motivated by glory, not prevented by Pinkie.
Balloon malfunction was rigged by Twilight, without the victim's knowledge. I'm not sure who wore the costume (probably not Fluttershy).
Runaway stagecoach was rigged by the mane 5, without the victim's knowledge, under AJ's assurance that she could stop it in time.
The building collapse was rigged by the mane 5, without the victim's knowledge, under Pinkie Pie's assurance that she could walk into the chaos unharmed, allowing her to save most of the victims. (It's also sad that the one person RBD saved was an ingrate, choosing instead to follow Mare-Do-Well.)
The dam break was rigged by the mane 5, without any victim's knowledge, under Twilight's assurance that she could stop the water and repair the dam before it hit Ponyville.