EBITDA is a pretty straight forward method to value a business (determine the price you're going to pay for it). It is typically used as a high-level estimation when a company is not listed (as opposed to Enterprise value).

To do that, you are looking for comparables. The theory is that - absent of any adverse indications - the company is comparable to a set of companies within a narror range of conditions. The market, the size of the company, a narrow business definition.

To do it practically, you'd pick a comparative set and apply the same ration between EBITDA and acquisition price as a ballpart indication. That's why in this case you need to exclude the company in Japan and the company that is nearly 20x the size. After that you can use the average of other multiples to estimate the price for this company.