If memory serves he left because they only offered him a one year deal. If they'd offered two that would have taken him up to the exact point at which he was nearly winning the premiership with Brisbane. During this period it's possible Lachlan Ilias would have got tired of waiting for his chance and signed elsewhere, at which point Souths would have needed a long-term solution at half back and possibly a temporary 'bridge' player who could do a plausible impression of Reynolds until that solution arrived. For instance, Aiden Sezer for 2024 and Jarome Luai thenceforth.