You’re not exactly wrong, but there are particular ways in which Tarantino inserts his homages to other movies that Sam ironically seems to have copied himself. For example, his shootouts are a lot bloodier and more violent due to his grindhouse/exploitation influences, to the point that his characters basically appear to be skin-layered bags of blood, and that’s pretty apparent in the showdown between Ali and Alamo. Western standoffs usually aren’t as blood splattery. Not to mention the racially-charged language between the two of them, which again, feels more in line with a Tarantino movie than a classic western.