Very few. Companies don't just go up there with a hand full of papers and say approve me. In a deal this big it probably cost them 10% of the cost. Most even hire a firm specialized in the requirements and it sometimes takes years. The work is all done before they make the official request. People treat this like its the first time DP or the UAE ever went through a US security check. We have bases in their country and they have been a Alli since their inception and they don't have a security check? No one would buy a company for 6.7 billion dollars without being sure of passing a security check. That would be insane. One of the agreements they had made was a open Israel office in Dubai even thought they have been doing business through the back door for years.
They also have a good track record and have been through the check many times. They lease several airport terminals in the US and they are handled in the same manner as seaport terminal. In addition they own CSX containers, home office Charlotte NC and already have access to port terminals. There was simply no reason to turn them down except politics. If you look it up you will find they have been through the CFIUS security check many times.