Thank you all for your help.
Groom - yes I have his WW1 registration card, do you see where it has Mr Watkins crossed out and Mrs Mary McEvoy written in? She was my great granny, his sister - that was how I knew for sure that this was our man.
I think you are right too about him entering the US under an assumed name.
Erato - The Albert Snowden in that 1910 arrival is not the same man, although born in the same year, I have other records of him that show he is not our man (one being 1918 arrival into Boston with his wife Alma - address in Sheffield,UK)
Again, thank you so much for your time,
Denise