This will cause them to fall behind the guys who stuck with it even sooner the next time. By the third time you'll probably be so frustrated you'll just fire those 5. Then you'll have to make due with 15 workers who have to work much harder, want more money because of it and still won't be able to make quota cuz the crew is too small. If you hire 5 new guys they will start out even further behind than the guys you fired. Learning a proper stroke technique is a lot like training that logging crew.
Swimming is a complicated set of actions that relies on the coordinated effort of a lot of muscles.
It also requires a certain level of physical conditioning. There is a a lot of trial and error. If you are trying to perfect a long, efficient stroke remember that this technique uses more muscles and muscle fibers to get the job done than a shorter stroke does. If you stop worrying about how fast you are going and worry more about how well you are swimming you will be able to get the whole crew skilled, coordinated, conditioned and on the job. This is the only way to maximize your potential for swimming speed down the road.