I agree with you, your analysis have a strong point yet I really can't say that ( from my personal point of view) is enough to put Carla in the top list, again this is my personal opinion I don't want in any way that this should be seen as the only acceptable point about the LI's list.
To me they all hold an equal and stable position as fav characters, Judie with her bubbling and caring personality, Lauren being ad hard to get yet very loving and caring girl, Carla being the strong and caring mother yet being also a beautiful and sexy woman (for me she's on par with Becca in MNF), Iris with her super adorable and intriguing sexy craziness, Jasmine a fierce fearless sexy tsundere ( with a big heart and ready to leave all to be free and in love with the MC), Aiko strong willed yet with a very sweet personality, Rebecca with her kindness and that crazy side that make her simply adorable.
No sorry my friend I totally accept your opinion, but I stand on mine, I love them too much to choose one among the others, I apologize.
P.S. Of course I like your posts how not to like a person that is willing to talk and interact with solid arguments and respect instead of spiting among the other opinions? I wish we could always have this interactions, the forum would be much more enjoyable this way