Near the end of last year, they have some Gen #2 with the vent on top instead of the left side, like the 2 in your pic #1.
The other things you are confusing are Water pans, Drip pans, and drip plates.
The Water pan in Pic #6 is the redesigned water pan---It is deeper on the left than on the right, which is why I call it a Split level bottom. It is used in the Gen #2.5.
The Drip pan in all of the MES smokers is the big pan that sits on the floor of the smoker.
The Drip Plate is only in the Gen #2. It sits above the Chip burner, and is higher on the right than on the left, with a small water pan hanging in it on the left end. It was supposed to catch drips which would run downhill to the water pan. This slanted drip pan in the Gen #2 traps heat under it, which is one of its problems.
Gen #2.5 have shields over their front controls, like your pic in post #6. The pics in Post #1 do not have the shields.
Bear