Yes, Einstein does give you the option completing school in 5 years for the price of 4. There are various reasons why people choose to do that route. A couple of my classmates "decelerated" their first year. A few chose to do so because they found that doing 2 years of school work was a bit rigorous, so they will be doing 2 years of work in 3. One classmate took maternity leave. I also had a couple of classmates enter this year that had started and then came back. I don't know what their reasons were.
Einstein also permits students to take time off afer their second or third year to either pursue an MPH or to do independent research. I'm not sure how many students are considering the research option because I haven't finished my second year.
I know personally, I was considering a MPH. But, quite frankly, med school is already a long haul and another 4 years of residency. It requires many sacrifices emotionally, personally, and financially that it's hard for me to know if I want to postpone graduation, even if it's only for a year.
But to dispel the myth of the wonderul 5 for 4 (and this goes for anywhere that you would do 5 years of med school in 4.) The caveate is that you do end up paying the "student fee," ~$2000, for each year. And, don't forget that even if you take an extra year, you'll be paying interest on loans you've already borrowed which could amount to $3,000-4,000. And, you still have to borrow money to live tht extra year you take off which is another $10,000-12,000. So, all in all, you're still paying $18,000 by the time you're done with that 5th year.l