Lord-Leafar
Two Thousand Club
That does make sense, but I have certain doubts for the following reasons, the way one single Solar can't stack TWTT it's because of the charm duration, namely you have to keep the charm's mote cost committed for that whole week while it's in use, meaning you can't double-activate it, and during that training time your essence is focused towards one particular skill/attribute/ability or what not, any other charm or effect coming into play that works towards the same benefit (two charms training to raise melee for example) would only benefit from the stronger effect (in this case, the shortest duration), we could use the bonus stacking part of the errata as a further guideline to support this, in which only the greater benefit can be used when two bonuses come into play, in this case if you have a Solar and a Lunar using their respective training charms on a unit (which should have no issue as they're different charms), Drill can only be increased weekly as by one single use of a charm. However, what happens when such charms train the additional different effects like HAM, since each charm actually only requires 5 hours in a given week from each user, there would be no issue with having each solar (or lunar/abyssal or what not) spent their committed essence for the whole week with a same group, as long as each trains a different additional trait for the duration of the charm, this way Drill is increased by 1 every week to a maximum of 5/4 (the higher in this case, depending if it's a Solar and/or a Lunar doing the training), but each charm's additional benefits could stack further as long as they're geared towards different traits, obviously this means that the units needs to train at least 10 hours a week or more if two or more Solars/Lunars train them together.Link for the purposes of discussion.[/URL]
Of course, I'm not Sherwood. But there's my 2 cents if you're interested.
Of course, there's no solid rule to say one way is correct or incorrect, after all it comes down to an interpretation of the rules as we have them, which in this case falls on Sherwood's take on the matter, if it's doable cool, but if not, no biggie.