Well, his career was just starting out so of course heads weren't calling him the goat.
Yes. There are advantages and disadvantages to his untimely death, in regards to how he's viewed as an MC. Big had the advantage in going out on top and not aging, but in the negative he wasnt able to put together a full career of music. We all know this.
But my statement remains. Big was an artist whose peak hasnt been approached by a rapper since. Big was so effortlessly great at everything. His storytelling, his versatility in going from menacing to playful and not lose a step, his ability to engage with the ladies, his flawless and commanding voice, his hitmaking ability, his lyrical arraignment and cadences, his flexibility in expressing extreme pain (and making you feel it), and ultra confidence, etc, etc.
Ghost is one of the best that ever did it, and there are things that ghost does better than BIG (abstract and clever being a couple), but as a complete MC? Naw, Ghost aint close.