Even though Howard's physique is totally looking great, I don't believe he is in the shape to play at NBA level. Even at his last season in nba, he was not doing good. Now he is older and played in lesser league. I don't think he can be slightly effective.
Howard averages 23 points, 16 rebounds, and 5 assists per game in the Taiwanese league. Of course, if he could go back to the NBA, his stats would be 2-3 times worse, but that's not the worst thing. The problem is that Howard is still injury prone, and as far as I know, he's often bothered by knee injuries. The way I see it, his age and injury-prone nature could be the deciding factor why NBA teams probably won't offer him a minimum contract this offseason.