I actually think this could be pretty fun in fact. Give another actor a chance to do his or her interpretation of this character. Compare and cotnrast.
And Kelly, I never meant they have to be incorporated into the cast of Supergirl or anything like that, I agree it's her show. I just felt they could work as "guest stars" from time to time. I said "Earth 38" versions for a couple of reasons - The first is taking "advantage" of the fact that Supergirl is her own thing, her own Earth and airing concurrently to the other shows (otherwise they could make them come from anywhere) and the second is that, unlike the "main" shows it seems to have a more classic, comic-book-like approach to its world and superheroes (Arrow, Flash and Legends seem more "CW version" if that makes sense).
Fans are kinda weird with other actors playing the role of their fav, and when that fav happens to be played by a very popular choice for that popular show. We will see some of number (and most probably not even comicbook fans, rather fans of Glee

) are going to scream bloody hell and the actors will go on twitter and love all over each other's interpretation of the character, blah, blah, blah.....but that is not the reality of the comic fanboy and girl....it just isn't.
NOW, do that on shows that are on the same network? Hell, fans with TOTALLY DIFFERENT CHARACTERS, AND I MEAN TOTALLY like Supergirl and Jessica Jones went nuts once Jessica Jones aired. I love both series, but good lord some of the fans were rabid simply because it was two female heroes. The actresses did an excellent job of calming it down on twitter, I can say that....but fans are just strange. Just wait until Ms. Marvel comes out, we will see backlash there as well, the thing that will help is that both actresses are very respectful, both are very complimentary of each other, so I think that will go a long way to handle that situation, but there will be one. NOT FROM ME, I enjoy the work of both actresses and can't wait for the Ms. Marvel movie. NOW, a Supergirl movie without Melissa???????? I'll have to get back to ya on that one. hahahaha
As far as the last portion of your post, yeah I can agree with that....
And as far as "her show" I am not one that really worries about that, the writers have held true to that, and as I have stated before, IMO, even Superman did not take away anything from Melissa's portrayal of Supergirl. So to me, that isn't a worry at all.
One of the things that have kind of pushed me away from Arrow and LoT (LoT I was just never able to get in to) was the number of players in the game. First season of Arrow was great, second season I was still wanting to stick with it, but after that, just too many cooks in the kitchen. And though I can see the need for the help, so to speak, and have gotten back into Arrow this season because I'm looking at it in that way, I don't see the "need" for it on Supergirl.
I totally get that some fans want to see their favorite comic book character on TV so bringing them in is very cool to them, I get that....hell Superman was a slam dunk, goal, and TD rolled up into one, but IMO, it was something that "needed" to be done. They are family, we should at least see him a few times each season. Maggie Sawyer has been a really nice addition to the show, and so has Miss Martian....but neither is playing a HUGE ROLE at the moment, they are very nice complimentary characters to other characters on the show besides Supergirl. Mon-el is that complimentary character to Kara....so at the moment, I just don't see a need to bring in any others. I WOULD MUCH RATHER THEM, focus on great, solidly written villains. IMO, that is this season's weak point.
And please divan, don't get me wrong, your thoughts and suggestions are the same as many fans out there, they aren't WRONG.... hahahaha, I, myself, would much rather the showrunners, writers, etc....concentrate the money, and time on better villains rather than bringing in other heroes....that's all.
