I'm all for artists taking liberties with other styles, such as drawing a character in their own style instead of the original artist's. However, Dobson doesn't have a style to draw something in, so he has no excuse.
His style is some really painfully generic mix of western cartoon aestethics and his old baggage of half-assed anime-influenced designs... The most unique aspect of his work in the past has been the floating eyebrows of doom - which he thankfully abondoned, cause they were fucking dumb.
Just for reference:
In Japan, oftentimes well-known Mangaka make tributes to the works of other Mangaka, for instance to celebrate a certain milestone (anniversaries or big publications) or just for the hell of it.
For instance, here, we've got Abe Yoshitoshi's (You might know his work "Niea_7" or "Secret Experiments Lain") take on Asuka Langley from Evangelion.
Or a different artist, this time it's Samura Hiroaki (who's mainly known for "Blade of the Immortal"), drawing Suzumiya Haruhi:
Both characters are incredibly iconic in the manga and anime scene, however the artists managed to both grasp the essence of the characters but also managed to make really good renditions of them in their own unique styles. In both cases, you could easily identify the artist who made them by the way how the coloring is handled and you can tell what character it is supposed to be. Despite the styles clashing with the iconic designs, the personal style of the respective artist manages to carry the overall image. Dobson is very far away from doing that - ever.
And the reasons for that are simple:
On one hand, when Dobson tries to render stuff in its own style (like drawing Stitch or *shudder* Ironman), it will always look off-model, since Dobson isn't good at emulating the styles of others. His usual shortcomings as an artist (like his inability to draw hands or issues with perspective/lighting) really poke through here as well. We *know* what the characters are supposed to look like, so even small mistakes can make them look 'weird'. Also, the fact he puts two different styles into one image means they will not only look like poor cargo-cult renditions (compared to the originals) but also mismatch a lot with each other, which will also emphasize the shortcomings of the emulated styles.
This leads us to a different issue:
Dobson's painfully generic, bland, boring style. He could never make an image like the two above, since his personal way of drawing is just so incredibly dull and unremarkable. There is nothing identifiable or unique about it (aside from floating eyebrows and terribad hands).
He's unable to draw in someone else's style and he doesn't have a style of his own. And he's hammering in that fact with every image of his current crossover-project.