It's surely lots of reasons.
We have been incredibly unlucky which happens. As with any set of data you don't use one set but a series. For example if we have a summer in the UK as hot as last year, then we are in sh!t street in terms of climate change.
So I think there is definitely a small link between lack of transfers and maybe injuries to players. Our squad is not the size of City's so can absorb less. United have had quite a few and they like us had numerous players at the world cup and only added Fred.
We have also played the joint most games I think or just behind Chelsea.
Another point is injuries to the same players. That suggests a lack of being ready on their return or maybe rushing back or their bodies compensating leading to other injuries.
As for our many semi-final losses, lets not conflate the 2 things.
Last night we lost with a side that would never have been on the same pitch if our full squad was available.
So the unbelievable number of semi-final losses continue (must be a record surely?) but even posters like me would be unfair to criticise Pochettino too much here but we need to cross the line the next chance we get.
Seems to me semi final time is groundhog day, we always seem to have loads of injuries and general fatigue by this time of the season, Son at LWB anyone ?