I see the point you're trying to make, but in this case, aliens can easily send one or two (gorge + skulk, maybe) to hit the hive in case a ninja is around or something. For example: A Marine makes it to the hive, stays outside for a PG. No aliens are around. A smart Marine does not hit the hive, to ensure that he isn't met with any more resistance than he can handle.
Another example: Marine gets a PG outside of hive. A lone alien is in the unbuilt hive. What does the alien do in LM? Hit the hive, of course. Normally, the Marine would wait for reinforcements before htiting the hive, to prevent the MC rush.