Thank you! So this sounds like I cannot use a Straight Killotine as a Flush Cache instead. Thanks for the clarification!
FWIW, as I wrote before, I have no idea really about poker; that’s why I have no slightest idea about its inherent assumptions. I did not see a warning in the game’s description that “you must know poker rules to be able to play this game”, so I did not make such assumption :) Part of me asking those questions - other than sincerely just not knowing the answers and trying to clarify and understand how I could play it - is to also try and show to you that there are people like me to whom those poker parts are the furthest from obvious, so you might consider including some such basic explanations somewhere in the rules, if at least in the Full Blown Kickstarter Version, to make sure people with zero poker knowledge can still enjoy this game :)