I do think you have an advantage if you can hammer out a bunch of games early on with certain races. Some races actually do quite well when down in TV (I would say skaven for example... getting a free wizard is probably of more value to a skaven team than playing a team with 150k less TV's worth of skills). Others do much better when they aren't out-skilled, like chaos. So sometimes yes, this is an important consideration.
Another issue with the COL format in general is theres a big dis-incentive for most coaches to keep playing after the 3-4 weeks mark because by then, theres a bunch of well-established leader teams who are going to be very hard to overcome, and starting a fresh team to charge through 40 matches in a couple weeks just isn't feasible for most people.
I would like to see a two-tiered season system, where you basically offer up wildcard spots to X number of teams who have the best records AFTER a certain date. This could work with LE, once we have more teams and the playoffs expand, and there are better tools to customize and format leagues.
So it could work like this: 24 teams in LE, the top team from each race across the 6-week season still qualifies (same as now). For the final 8 spots (making it a 32-team playoffs), you take the 8 teams who had the best record over the final 3 weeks of the season. Or even the final 2 weeks. Games played in the final 3 (or 2) weeks would still count for the regular overall standings, but they would also count for the second-half wildcard standings, so that way if you wanted to start a fresh team but didn't have enough time to play all 42 games over the final 2 weeks, you still have a shot. Or say you had a good team from the start of the season but your record is like 20-6-5, and the leading team in that race is locked in at 35-4-3, you still have a chance to qualify with that team based on your performance over the final 2-3 weeks in the wildcard standings.
This way, everyone is incentivized to play until the end, which basically solves both problems. First, you don't have such a big drop in player population after the first couple weeks of the season. Second, you don't have as much of an advantage anymore if you're an early-season grinder, since there will be more people playing fresh teams later in the season with this wildcard system.