Only 1 can Aid, the other five have to make the rolls. And yes, I know this particular one has the least number of characters who are trained in one of the three stats. It was designed this way. They can't all be cakewalks.
And on that note, I really have to say... although I realize why WotC did the errata for the DC check table on page 42 of the DMG... I think they went too far in the opposite direction. The original chart had for 1st to 3rd level the DCs of 10 for Easy, 15 for Moderate, 20 for Hard, and you were supposed to add 5 to those when making skill checks. The theory being... a person trained in a skill that is based off of one of their main attributes would have usually a +8 to +12 skill modifier (average of +10). Thus to make the Easy checks you'd need a 5+, Mods were 10+ and Hards were 15+. This is pretty much how you'd want it.
However, once the books got released and people started trying to make these checks with non-trained skills whose attributes did not line up... they found that they were needing to make like 10+, 15+, 20+ on the rolls... a statistical improbability when you needed to make 6 or 8 successes before 3 failures.
Thus, they printed the errata that lowered the DCs to Easy 5, Mod 10, Hard 15, and (which is the biggest problem) they removed the +5 to these numbers you add for when its skill checks rather than ability checks! For a 1st to 3rd character to make skill checks, they now only needed a 5, 10 or 15. Now this is fine for those times when the characters doesn't have them trained and/or their ability score is low, because even Hard skill checks are still possible to make... but for the trained skills on high attributes, it's virtually impossible to fail rolls, even on theoretically Hard skill checks. They basically lowered all DCs by 10 points and made things way too easy.
Despite the note in the errata to ignore the subscript note on the DC chart, I think I am going to start adding in the +5 for skill checks in my own games. DCs of 10, 15 & 20 are good solid numbers that are workable/possible for both ends of the spectrum... the non-trained/unmatched attribute skills, and the trained/matched attribute skills (i.e +0 and +10).
Anyone else worked with these charts before? How did you feel about them both pre and post-errata?