I watched the movie again out of love and support, and I do wish I could see more dialogue coming from Sidewipe and the Arcees, but then I thought maybe as a method to save money and time, the modelers and animators created versions of these characters that were never meant to be seen SO close up that we wouldn't notice their imperfections. More than often when developers create a video game, things in the background that players will never see up close are designed with less polygons and smaller textures to make the game run smoother, but also because it requires less time to create, thus saves money. This is called LOD (Level of Detail) Perhaps there was a discussion where ILM said, "Look, you can choose 3-4 characters that can talk up close, and we will painstakingly make the detail in their faces hold up against scrutiny. We can still animate the faces of these lesser characters, but you don't want to shoot them up close" So naturally, you can't have a conversation from 20 yards away without the need for some kind of closeup, thus characters like Sideswipe never got more than a few lines and Jolt received none (Hell Jolt may not even have a moving mouth or eyes). I know a lot of people would have taken Sidewipe over the twins, but we already had Prime as a badass, as well as Bumblebee and Ironhide, so another Badass character up close (despite being cool) was probably not the optimal choice when the twins brought something else to the table, thus they were created with (Close up detail). This movie can't be written or created like anything before it. The script was written and then meetings were had where people may have said, "Look, if you want to make 2009, we can't have that many characters talking on screen. It would take too much time to design those characters up close, so you need to massage your script into something that works with our time contraints." So it's not about, Less Twins time = More Sideswipe time. It's more like you can choose one character for us to model and animate to our best capability, meaning Sidewipe may not have a Super Close up Rig for talking and emoting, so swapping screen time may not even be possible. The Twins were a better choice from production standpoint because Sidewipe would have been just another badass, and Ironhide already had a Rig from the first movie. I dunno, just a thought.