Sean Taylor's half brother saw no issues with the Commanders' memorial of the late Pro Bowler on Sunday ... telling TMZ Sports the whole thing was "an honor" -- and he's expecting more to be added to it as time goes by.

Washington officially unveiled the Taylor tribute at FedEx Field on the 15th anniversary of the free safety's tragic death just before the team kicked off its game against the Falcons.

Fans poured out in droves to see it ... but many found it underwhelming -- noting it was simply a wire mannequin covered in mismatched gear.

But, when we got Jamal Johnson out at Reagan Airport in D.C. on Monday -- he told us it was all fine by him.