Going by SSGE Optimus and Megatron and the look of him in that box lol, Starscream won't be very big. At least it should be a fair bit bigger than the deluxe Starscream as unlike deluxe Optimus and Megatron, Generations FoC SS was made after the size reduction. I can't wait to get SSGE SS and Legacy United Cybertron Starscream. Just need a "MP" third party Armada Starscream and a deluxe Cybertron Starscream now.

We got Shapeshift Inc. "legends' WFC SS, FoC deluxe SS,  Legacy voyager SS and Planet X SS. 

We got legends Cybertron SS, the upcoming Legacy voyager SS, Galaxy Force voyager SS, Maketoys SS and Cybertron supreme SS.

We got a third part "legends" Armada SS incoming, T30 deluxe SS, Legacy voyager SS and Armada voyager SS. 

So this way you can pose them all on a shelf like they're Ant-Man growing lol. And of course, there's too many G1 Starscreams that could work for this too but he's boring lol.

Let's see: Universe legends SS or a third party "legends" SS, Legacy core SS, Classics deluxe SS, Earthrise/SS86 voyager SS and then a bunch of different MP and third party "MP" Starscreams. Yes I'm crazy I know. Oh wait, Titanium SS, Impossible Toys SS and Siege SS lol. We need more G1 Tetrajets.