Does the govt need absolutely to inject cash to lower the Blue rate? I guess not. The govt of course knows the effect of the half aguinaldo, elections are 4 months away, there's tension with the agropecuario sector about the dollar rate, etc.
That's why if the Blue rate doesn't move upwards in 10 days, then the explanation might be it's artificially lowered. After all, they just need to tell the major cuevas (source for the Blue rate?) that they don't want the Blue rate to go above 8.50, otherwise all their families will get a tax audit, etc. In exchange, they could tell those cuevas they will be left free to operate (they make money on the buying/selling spread anyway, no loss).
We'll know for sure during the next days!