JMHO,
I have always used jars when I open a tin, mainly to stop the tobacco from drying out, if I have several blends open. Ghosting, I have only found when smoking say a heavy Latakia, then a Virginia a few days later in the same pipe. So half my pipes are for any blend with Latakia, and the rest for most others. The only exception to that is my cobs and Meerschaum. The Meerschaum has never ghosted, and I’m not too concerned with a cob, that has a little extra flavor to it. My more expensive briar pipes, those I keep separated. I suppose you could get cross “contamination” from the aromas, but I honestly don’t know if it would impact the actual taste of the tobacco.
Hopefully someone else will chime in on that topic, since I’ve never experienced it.
I just went with jars from the start to save myself any hassle.
HTH