For me it would be extremely short-sighted to manage risks this poorly. Considering the injury he had when he joined the club and the lack of pre-season you increase the risks of picking up injuries, and an injury to Højlund would mean having to either play with Rashford or Martial (for as long as he lasts, probably not long) as the main striker.
Our losses, apart from perhaps Tottenham, aren’t exactly disasters. We could’ve easily won against Arsenal, the most marginal of marginal offside decisions went against us followed by disaster defending 101, third goal is simply a result of going all in for a point. Today, against Brighton, we create plenty of chances and consistently get the ball into dangerous positions, completely fail to take advantage and Brighton in turn are as effective as it gets. First half was solid, second half was a disaster.