I think it is a testament to Michael's love for Marcie that he would be willing to name his daughter after Gabrielle. Gabrielle was the closest that Marcie ever came to having a mother. So it makes sense she would want to name her child after her. Not only in Al's honor but in Gabrielle's too. As a tribute to the woman who treated her like a daugther and loved her like one.
And Michael is not afraid of Al. Not jealous of him. He respects him and by the time Gabrielle died the two souls (Michael and Al) were slowly blending into one soul. Michael cared about Gabrielle too. It may not know why but he feels connected to her as much as Marcie did.
I don't see what the big deal is...it is a sweet gesture that he would do for Marcie and for Gabrielle and for Al.
Tina

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