Generally, no but you have to with "Red Nova Dragon". Jack called it "Double tuning". XX-Saber Gottoms does not have the 'non-Tuner' restriction; it requires a Tuner and one or more Earth monsters, these can be Tuners.
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First you need a tuner monster and a regular monster. Then, when they're on the field you can add up the levels of the 2 monsters and synchro summon a synchro monster with the same level as the combined level of those 2 monsters. The tuner and regular monsters are sent to the graveyard. E.G Junk synchron+ speed warrior= junk warrior
No, unless specifically stated otherwise on the card, a monster's special summon requires it to be summoned from your hand, or in the case of Synchro and XYZ monsters, from the Extra Deck.Plaguespreader Zombie can special summon itself from the graveyard because it says it can. But you cannot use for example, the special summon requirements on Chaos Sorcerer, or an XYZ monster, while they are in the graveyard.
Unless they are monsters that are special summon only, level 7+ monsters require 2 tributes.
Buster Blader and Dark Magician
Normal summon: Level1~4 costs nothing. Level5-6 requires 1, Level7+ requires 2. Special summon(Ritual, Synchro, and Xyz): All you need for summon is to meet the requirements that's stated. If it states a certain card must be tributed to special summon then yes, otherwise no.