Next year, Moreland and Elvis are both gone. Gallo is called up to play first and Profar is moved to short. Best infield in the majors at that point? I would have to say yes.
Best in the majors? How is that? Gallo hasn't even shown he can stick in the majors yet.
I wouldn't even rate their infield as better than the Twins with Sano/Plouffe (plouffe will be gone next year), Nunez, Dozier and Mauer. And I wouldn't say they are one of the best in the majors, either. Odor and Dozier are a push. Odor better avg, Dozier better power and defense. Sano and Beltre have similar offense right now. Sano is pretty good defensively for a big man, and I admittedly don't know much about Beltre's defense. I do know that he's about 167 years old, though. Sano is 23. They are clearly headed in different directions. Short stop I'll give to the Rangers if that's where Profar ends up. Question is, will he keep it up? And Nunez is batting .350 with 10 homers so far this year, and great defense. I'll still give this to Profar, as Nunez is having a career year and while a good player, history has shown isn't THIS good. Gallo and Mauer at first? Mauer all day, every day. He still bats .300 in his sleep and is always at the top in doubles and walks, while providing gold glove caliber defense. Until Gallo shows he can stay up and bat more than .225 consistently, this is no contest.
I'd be interested in why you think the Rangers would have the majors best infield.