Sending the target to the Graveyard and Special Summoning the Synchro Monsters do not happen at the same time. 
Suppose that "T.G. Blade Blaster" banishes itself and then Special Summons itself back to the field during the next Standby Phase. If it is targeted by the effect of "T.G. Recipro Dragonfly", then it is sent to the Graveyard, but you do not Special Summon the Synchro Material Monsters from your Graveyard.