No. To use FTG you need to be a sensor ninja like Tobirama and Minato. They since wherever their markings are, no matter how far away it is. When a Kunai moves with Minatos seal on it, he senses it, no matter where it is in the shinobi world. Thats how they teleport. They sense where their markings are and using Yin energy (spiritual) that allow themselves to teleport themselves to the given location
I don't think so. Being a sensor compliments along with FTG. Nothing has ever suggest that being a sensor is a requirement as far as I know.
OT: There seems to be hints of him using FTG. Here Tobirama said that he was able to
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. Another evidence basically the Shadow Clone itself. The reason being is that Naruto's first jutsu
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, who was also the
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. Minato and Tobirama's fighting are similar in a way that they combine the use of S/T and Shadow Clones in combat. Naruto himself has almost always used Shadow Clones in his fighting style. And I don't know where else the knives will go after Minato's death.