Hi, I want to get my engineered red oak floor refinished to Ebony dark color. My floors are about 0.375-0.4375" thick currently. The contractor said he could not do dark b/c of beveled edges. He said it wouldn't absorb the oil stain properly between the beveled edges. He said if he went dark then after 3-4 months the yellow lining will show b/c it didn't absorb correctly.

He then recommended Dark/Warm Gray or Provincial. Is this true? Can I not go 50/50 Ebony and Jacobean ?

Any advice would be helpful! Thanks. Current Floor Pictures attached.

https://ibb.co/WffSyk0
https://ibb.co/d615nMr

Refinishing means to remove the finish. Sanding the surface does not remove the finish in the bevels between and on the ends of the boards. If you want to change color the bevels will need to be scraped and sanded to bare wood. Using a chemical to soften the finish in the bevels before sanding the floor, then scraping it will take a lot of time. Most floor companies don't know how to do this.
Sanding the bevels off by deep sanding may be an option. This depends on the thickness of the surface.

Since I do not have much thickness. The contractor used 80 grit, and stained it 50/50 ebony/jacobean. Here are the pictures. Middle is a LVP of what color I wanted. He only applied 1 coat of 50/50 Ebony/Jacobean. Its not as dark as I wanted.

Would applying another coat make it darker? and what do you think about inside the bevel?

https://ibb.co/bXtp1WZ
https://ibb.co/2c7Sg1j
https://ibb.co/XScbxnR
https://ibb.co/4dLWzn1

Thoughts?

Did the contractor pop the grain before sanding? Popping the grain with an application of water before staining will make a deeper color. A second coat of stain will make a noticeable difference, too.
I would give extra time for the bevel to dry if all the non-absorbed stain is not wiped off completely.