It is probable that some of those without wealth like Flynn and Manafort were enriched by the Russian intelligence community, and there may have been or be ties between Trump and/or Kushner and the Russian banking community, as access to mortgage money is key in real estate. However, quid pro quo trades for information/influence are less likely. The unfortunate truth is that Trump and his colleagues were just dim, in the same way Bill Clinton was just horny. Truth is sometimes simple and humans are often coarse.