There are many other ways to pacify an extremely zealous following of Shun if such a following is indeed insurmountably big than to bring him back and almost certainly ruin the rest of the show.
You could have special episodes from Shun's perspective. You could have non-cannon material featuring Shun as extra offering to make Shun's fans buy the anime BDs. There is really no valid reason to bring Shun back.
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