It seems pretty clear to me that HHM is going to join in on the case because of Chuck not being allowed to do big cases without them. This will obviously cause resentment from Saul and possibly conflict with the lady friend (name?) but I don't think this will lead to any big epiphany for Saul to become Saul.
If anything maybe HHM uses this as an excuse to get rid of Chuck and that makes Saul start to dip his toes in the muddy end.
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