1. Because the intel formula is logarithmic, the difference in intelligence between the tribes will not be very important for crafter characters that will focus most of their EPs on intelligence (a char with 60intel will raise only 3% faster than a char with 35 intel, and this % will reduce as both keep increasing their intel)
2. We will in the near future make it so that a tribe trains a preferred general skill faster than others (5% if the tribe is 'Good' and 8% if the tribe is 'Excellent). This means that a pure crafter (who will therefore spend most of the EPs on intel) will be much less affected by intel than it is by its tribe's preferences. In other words, even despite the difference in intelligence, a Dwarr will raise Blacksmith faster than a Leafborn or a Lightfoot.