ORLANDO, Fla. — As the longest-tenured member of the Magic, forward Jonathan Isaac has seen it all. The Orlando big man has had a rollercoaster career injury-wise and has been along for the ups and downs of the franchise’s recent history from reaching the postseason to rebuilding its organization. He’s played for three different head coaches, including current Phoenix coach Frank Vogel who guided Isaac who through his rookie season in 2017-18 with Orlando. Now as the Magic (24-22) find themselves back in the hunt for the playoffs, Isaac serves as the team’s X-factor off the bench by offering c…