''Leslie Odom, Jr. has been in the leading actor category for all the precursors.''
Has there been that many? At the Lucille Lortel Awards, Odom and Miranda were both nominated for Leading Actor ... and Miranda won. At the Drama Desk Awards, Miranda was up for Outstanding Actor in a Musical, but Odom was up for Featured Actor. Neither of them won. At the Drama League Awards, they nominated Miranda and Daveed Diggs for Distinguished Performance (but not Odom). Neither won.
As for the Tonys, I imagine that ''Hamilton'' will submit Miranda for Leading Actor, but they could add Odom (I actually think of them as co-starring roles; yin and yang). Obviously, Odom would stand a better chance in Featured Actor, but it's still up to the Tonys on where he gets placed. The Tonys have the discretion to place an actor in whichever category they deem correct, regardless of what's submitted.