There are alot of cards that are still not in duel links that should be. And there should be a normal play version added as well to play decks to their fullest potential.
If you look at what they did to lava golem, yes.
Honestly it doesn't matter to me as long as they release the card itself. Playing red eyes with only slash dragon is kinda boring.
I think you want to ask about the interaction between Metalmorph and Mirror Wall (both affect your opponent's monster).
The answer may vary, depending on the time of activation.
Besides, if those 2 cards were activated in the same chain, remember the rule: the last card activated is the first to resolve.
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