I'm thinking they probably didn't get confused by early art/pics as the Lego version appears to be accurate to the production ship.
Maybe. LEGO's production/development time is a lot shorter than Hasbro's though. Not as many new parts to spec out and majority of their manufacturing is controlled by them.
Eh, no matter what, we all knew it was going to be way underscaled anyway. Especially with the AT-ACT already occupying the "big thing" slot for 2016.