Wait, subbing team still gets no salvage? I thought that'd be fixed after it (obviously) turned out that neither team wanted to sub. Otherwise we will get more drama, on both being online, but not at the same time and people being forced to sub etc. (even though upgrades part is apparently different?)
Anyone can substitute using the original deck (with upgraded cards if any). But when you substitute, you cannot salvage.
It is my understanding that last time we had drama because non-Subtitutes didn't want to substitute, or were tricked/forced to substitute, which led to winning team losing 3 card salvage. This new rule was made to prevent that situation.
The thing is that having to substitute must have a penalty attached to it. If there is no penalty, or the penalty is too low, people will stop trying to make duels happen and half the matches during a round will be fought using substitutes.