That is not at all what the comic has shown us at all. The Rise hasn't attended the Ascenticon rallies, they've attacked them, and Megatron specifically.
Violence from the Rise has disrupted Megatron's rallies. But, they are outliers to his base, not opposition. (That is why Megatron had to be asked to specifically condemn their actions.) The Rise could be opportunistically using the Ascenticons, or trying to exhort them to be more aggressive when promoting a shared ideology.
don't see how. At least not to the story itself. To the reader, sure. But, since I'm not a Geewunner, I don't need my crowd scenes populated by "toys a played with as a kid. Or possibly last week". I
Perfect. Just....perfect. (Especially the "possibly last week" part.)
Sometimes it is, and if the point was to show Megatron speaking to the future Decepticons, sure, it would need recognizable characters. Since that obviously wasn't the point of that scene, then it doesn't matter who the crowd is composed of.
Exactly. That scene is meant to show that Megatron is an elected official, and (apparently) a fiery orator. But, there was no good purpose to showing exactly what Megatron's motivations were in the first issue. (Is Megatron intentionally, or indifferently, fomenting, violence?)
On a related note: Ruckley makes a point of showing characters reacting to Quake (a known malefactor). This is a strong point in favor of Megatron intentionally fomenting violence. (Disappointing, but hard to discount.)