According to this timeline, ROTJ takes place only one year after ESB.
yeah, see I totally agree there. That's just the "official" timeline. I always thought that was weird, this was briefly discussed in a thread about Obi-wan's age in the various movies, and I said this about it-- maybe ESB is in their version of November and ROTJ, is in February of the next year. Then it would "technically" be the next year. That's the only way I can rationalize it.