Proud Puerto Rican-Russkaya!
??? Marco asked about long gap.Irina Slutskaya - 1994 - 2006 (where she mostly medaled and won 2x, and had a heart condition). Plus she made the team in 3 Olympics and earned medals in 2 of them (silver & bronze).
Mirai Nagasu, 2010, then not again @ Worlds until 2016. Like Tuk, a 5-yr gap.
Arakawa, only a 4-yr gap (between her first appearance in 1998, then back in 2003).