Wouldn't it make more sense if gaim was paired with ninninger then Drive with Toqgers?

It probably would. But such logic goes out the window when it comes to the mighty and powerful Toku!

What exactly is that despair-filled Hellscape in Wizard? Is it an actual location?

Those pairings rarely "make sense". We had Dinosaurs paired up with Wizards, Angels with Detectives and Car/Animal Hybrids paired with Vampires.

And they dont have to make sense since they are not supposed to work together in that way.

And to be honest the crossovers would loose a bit of their flavor if the superherotime shows always had themes that compliment each other.

There is no real explanation. Its a place in the Gates subconscious or something like that.

Is anyone familiar with the PBM Fourze? Was there really a module set that could attach to him, or did i find someone trying to candy coat and sell the regular one at an outrages price?

I disagree. Assuming this is a no-holds-barred fight, Mach's ability to create a density shift would easily allow him to keep up with, or even outspeed, Accel Trial. The density shift would also render standard Accel, Booster and AccelGunner useless. And without the speed advantage DeadHeat Mach vs Accel Trial would be an easy win for Mach, since Trial is explicitly weaker than Accel in all areas other than speed.

While I'd agree here on the technical side, this wouldn't work on a story base. Mach and Drive both decided they wouldn't use density shift anymore. ;)

I love Terui, but didn't Drive in Dead Heat punch freaking Heart through across a moutain or at least a really tall hill?

Trial and Booster can take that form, sure, but I doubt standard Accel is going to just take a Rider using Dead Heat.

When exactly was it stated that other speedsters couldn't just power through a Density Shift? I mean, wasn't Drive solution to that bullshit Heavy Density Shift to just get faster? ( and by the way, we've never seen the Roidmudes use again, even though Mach doesn't have that immunity, so they could upgrade another Roidmude (now that Chase switched sides) and target Mach with that). Booster still has the advantage of flight, and Trial still has access to the sword, so any extra damage he may need he can use one of his finishers using Engine to even the fight.

Actually, no. Drive Type Formula is simply resistant to the Super Density Shift, it's not the super speed that makes him move inside it. If the super speed was why he could move then Dead Heat should be slowed just like the other Types, but it still could move, even if a bit sluggish, and it doesn't have super speed. It's all about the resistance the shift car gives to its user.