Redtails do have plumage on the upper legs. Sometimes it is plain cream, sometimes cream with light ticking, sometimes with very dark banded markings.
Juvie goshawks have uniform dark markings on the entire chest and belly, looks like grace’s hawk has a substantial white unmarked area.
Juvenile redtail [not the race with darker wing markings]
https://v4s2.yimg.com/sk/3519/3850676259_d618d9d6f6_z.jpg