For five frustrating weeks that tested his patience, Jonathan Isaac’s primary objective was to recover from a right ankle sprain. And now that he’s finally returned to game action, the lean, baby-faced forward has a far more extensive developmental to-do list for the remainder of his rookie season. “All areas,” coach Frank Vogel said. Isaac has missed 18 of the Orlando Magic’s 31 games this season, and his progress has stalled somewhat as a result. Coaches studied game tape with him during his absence, and Isaac also attended practices and team film sessions. But nothing can substitute for stepping onto the court and competing against teammates in practice and against veteran opponents in games. Isaac looked and felt rusty Sunday against the Detroit Pistons as he played in his first game since he suffered his ankle sprain on Nov. 11. With his playing time limited to 17 minutes as a precaution, he went 0 of 4 from the field, turned the ball over twice and lacked his usual sharpness on defensive rotations. But at the same time, he still harnessed his agility, height and long arms to alter shots.