Center always was going to be a concern; few teams have answers for Roy Hibbert. Power forward was the difference during the regular-season series; David West has the type of bulk the Miami Heat lack in their lithe power rotation.

But now shooting guard is becoming an issue, with Dwyane Wade at times taking a passive approach in these Eastern Conference finals, while Lance Stephenson has emerged as an aggressive two-way option for the Indiana Pacers.

For now, the overall scale is balanced, with the best-of-seven series tied 2-2 heading into Thursday's 8:30 p.m. Game 5 at AmericanAirlines Arena. But a matchup thought to be in the Heat's favor now is as much in the balance as the series itself.

"He wants to rise to the challenge," Pacers coach Frank Vogel said of his enigmatic shooting guard.

In the Pacers' 99-92 Game 4 victory Tuesday at Bankers Life Fieldhouse, that meant taking the defensive challenge against LeBron James, doing enough to slow both James and the Heat's offense.

"I told Lance when he's that aggressive and he's pushing it and looking to score, we're a better team," Pacers backcourt partner George Hill said. "We need him to continue to do that for us to win this series, and he knows that."

Said Heat coach Erik Spoelstra, "He's an X-factor. We know that."

What the Heat didn't count on was Wade being a why-factor, as in why there isn't more there.

While Wade closed with 16 points to Stephenson's 20, Wade shot 5 of 15 in Game 4 while Stephenson shot 9 of 15, including a dagger 3-pointer to end the third quarter.

To Wade, it was more of a systemic failure.

"We didn't get to what we needed to," he said. "We had too many guys on the perimeter.

"Take nothing away from them, they're a great defensive team. But we got good shots. We just didn't execute."