TSQL - Gaps and islands with work weeks and breaks problem, Sql Server

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create table emp (Employee int, WorkDate datetime, NumBreaksInWks int, EndDate int, StartDate int);
    
insert into emp (Employee, WorkDate, NumBreaksInWks, EndDate, StartDate)
values
    (123, '2016-01-04 00:00:00', null, null, null),
    (123, '2016-01-05 00:00:00', null, null, null),
    (123, '2016-01-06 00:00:00', 2, null, null),
    (123, '2016-01-27 00:00:00', null, null, null),
    (123, '2016-01-28 00:00:00', 5, null, null),
    (123, '2016-03-10 00:00:00', null, null, null),
    (123, '2016-03-09 00:00:00', 1, null, null),
    (123, '2016-03-25 00:00:00', null, null, null),
    (123, '2016-04-01 00:00:00', null, null, null),
    (123, '2016-04-10 00:00:00', null, null, null),
    (123, '2016-04-15 00:00:00', 4, null, null);

;with weeks as (    
     select
         Employee,
         datediff(week, '20000102', WorkDate) as weekNum,
         min(WorkDate) as workDate,
         row_number() over (partition by Employee order by datediff(week, '20000102', WorkDate)) as rowNum
     from emp
     group by Employee, datediff(week, '20000102', WorkDate)
), islands as (
    select
        Employee,
        min(workDate) as workDate,
        datediff(week, min(workDate), max(workDate)) + 1 as workWeeks
    from weeks
    group by Employee, weekNum - rowNum
), gaps as (
    select *,
        datediff(week, workDate, lead(workDate) over (partition by Employee order by workDate)) - workWeeks as breakWeeks
    from islands
)
select Employee, convert(varchar(10), workDate, 101) as "WorkDateStart", workWeeks, breakWeeks
from gaps
-- where breakWeeks > workWeeks; ??

View schema
Execution time: 0,02 sec, rows selected: 5, rows affected: 11, absolute service time: 0,19 sec