You lost me . Post pics I honestly do not understand what your issue is

sorry - I can't post pics because the house is in Florida and I'm in New York. Basically I wanted opinions on adding a black granite extension to the island with a different granite now on it?

or a wood counter height console? but need one 90" long? thanks.

Were your tops Corian, you'd have no problems with an inconspicuous seam.

Is it possible to inconspicuously seam stone-to-stone 90"? Yes, but it probably isn't cost effective, depending on the stone color/particulate/movement, the fussiness level of the client, and availability of matching material. Got an island you wouldn't mind sacrificing?

I'd suggest a raised contrasting cap for the wall.

Thanks. What do you think of a counter height wood waterfall bar table butted up to the end of the granite island?

Thanks anyway