Brown has rushed for 92 yards in the Dolphins' first two games, but his average is only 2.7 yards per carry.
That might not be so bad if it weren't for the fact that Williams is leading the NFL with 276 yards rushing.
Coach Nick Saban said it's not right to compare Brown to Williams. Nor is it fair to make quick judgments about Brown.
"We need to wait five years; then we'll know wether the guy is a good player," Saban said Wednesday. "Give him a chance."
Fullback Heath Evans, who played with Brown at Auburn during Brown's freshman year, said he saw a "burst of greatness" from Brown in last Sunday's game against the Jets.
"He had a run down there about the 15-yard line going in the other day, kind of bounced out, made No. 50 just grab air, and then lowered his shoulder and got about another 8 or 9 yards," Evans said. "You can come from the best conference in the country, which is the SEC, but the speed is totally different here. I think he's doing a good job of adjusting and he'll just continue to get better."
Quarterback Gus Frerotte was asked whether he had told Brown anything in the huddle to keep the rookie's confidence up. Frerotte answered that all he told Brown was to keep doing what he's been doing.
""He's going to be a great player for us," Frerotte said. "I have no doubt about that."