Loopaza Mega Store - Timeline | Facebook Of interest will be the info that 50% of MP Inferno's parts are retooled for MP Grapple.
That confirms Grapple / Inferno are the same height as the van bros. Was hoping they'd be half a cm taller to sit nearer MP-10s height. Not the end of the world mind you, they still look great. Edit: actually they've made Inferno a touch taller looking at the back photos. Well played Takara, well played. That's an impressive amount of retooling!
Looks like Grapple might have a few mm over Ironhide as looks like his head goes just above the top of Prime's chest while Ironhides is dead level. Then as you say Inferno is a few mm taller so maybe you get your half cm.