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It was also hard to imagine this type of silly grin from Ichiro in 08 (or maybe ever?): http://i.usatoday.net/sports/_photos/2009/09/21/marinersx-large.jpg
That being said, both Sweeney and Jr. have made baseball cases to come back, not just chemistry-related ones. It is legit to say that both could contribute in the right roles.
Hall and Hannahan have the versatility to make up for a lot of the roster clog you'd get from two platoon DH-only guys, so to some extent the decision depends on how much you believe that one or both of them will provide non-disastrous offense when in there.