van den Hul Colibri, Koetsu Rosewood Signature, SoundSmith Sussurro Mk ii

Chakster is right. It will still play and probably sound  ok, but not it’s best with a light arm. I have had Denon 103’s and only got mediocre sound. Always wondered why all the hype. Similar compliance to Koetsu. When I got a 12” Ikeda (heavy arm) I finally heard the denon sound good. 

Ah yes, the 103.  Both it and its brother the 103R sounded suberb on the 11g Syrinx.

Sure, extreme mismatches are bad.  I wouldn't, for instance, stick a Koetsu on a Black Widow or a Grace 747.  Well, actually I would, but only out of curiosity and I wouldn't expect the combo to sound fabulously.  The DP6 with a yellow tube will likely be borderline and less than ideal, but with a blue tube I'd be happy to put 5 bucks on it sounding superb.

Short of serious or extreme mismatches I'm perfectly happy to maintain that bearing quality is the paramount determinant of whether or not the arm will handle a cartridge, followed by overall manufacturing quality and tolerances.

If those are all covered the arm will in all likelyhood handle cartridges well outside what's recommended by that table everyone's treating like holy scripture.  That has certainly been my consistent experience up until and including this very day.

Thanks, Agrippa.  Applying the formula on the Moerch arm/cartridge matching site, both the colibri xgw and the sussurro mk ii should work well with the DP6 yellow arm. I had focused on the Koetsu Rosewood when I originally planned to get the blue armwand, then forgot to recheck it after making the last minute shift to yellow just before the arm shipped.  According Moerch, at least, the blue arm is a comfortable match for the Koetsu, and I'll probably try that combo at a later stage.

Well, if anyone knows it ought to be them.
Best of luck whatever you end up with!