Well, that's taking my point from the other end lol. Ultimately, depends on if your 4+*s are fast or slow. The three you listed combined can make for a VERY fast team (which on some maps end up being the boss and ending map too soon and you miss some pests).
TLDR: If you're going to raise 2/3*s seriously, focus on ones with extremely high or low speed and use them to balance/unbalance your 4+* teams' speeds to make sure u hit all pests on map.