Reef nutrition

What happens after an Acro covers a frag plug?

So I have an acro frag that has completely encrusted the frag plug, however, I kept the stem on the frag plug and mounted the stem to the rocks.

So now there is a gap from where the acro has covered the frag plug and the frag plug touching the rock. What happens with the growth now? Assuming the coral can't encrust anymore, so would it begin vertical growth?
 
It will likely still try to grow, possibly even creating branches outward, when those branches touch the rock on the other side of the gap they will start to encrust at that point and puddle onto the rock locking said frag plug to the rock.
 
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