The concern is did the terms work to the benefit of the buyer. In these situations the reconciliation is price and value. The two are not necessarily the same. Price takes into account the motivating factors. It is the end result of the negotiating process.
Price is often subjective, value is always objective.
For demonstration purposes we are going to consider three scenarios. There is no balloon. The same investment property, the price is changed by financing with an above market rate second mortgage. The cash throw off and the percentage return to equity for all three cases is identical. Still, the actual value of the property does not change.